{
  "manageEntity": {
    "action": "Save",
    "entityId": "1488811528",
    "entityType": "Track",
    "nonce": "1780773250086712577",
    "signature": "0x77823ea18ec671a91e6e3d17fe5f971b36ef99d4d85a372903fc054119e95538690cf7a6512c4a66e5bc45b54342418eded7fde4245f08e9a8ae82784ad493bd1b",
    "signer": "0x286E7ad8f9447D0112953Bdb1684A4b4192ECb76",
    "userId": "210545"
  }
}