{
  "manageEntity": {
    "action": "Save",
    "entityId": "1519610455",
    "entityType": "Track",
    "nonce": "0xee73a644c5c362a15924102c55f3418864fb9df4aedd0af473599a2eb4d88e05",
    "signature": "0x503b74dd294de09a29eb782246087828134bdd6e7edeaab9b97deb3771fe8ea32ba38d3cd0f2a9f0816ec20da4714c820d0b4000329dc8d787e49aefc7b8426e1c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}