{
  "manageEntity": {
    "action": "Save",
    "entityId": "1149747906",
    "entityType": "Track",
    "nonce": "1788150528896920801",
    "signature": "0xa9555fb68b63d2b36a8710990779530c2a319f4ce088ee238bc03f832a2f4734681947a20beaa9da58ba222fd2162aed96802900427138466c325db0348fedfb1c",
    "signer": "0x286E7ad8f9447D0112953Bdb1684A4b4192ECb76",
    "userId": "178070"
  }
}