{
  "manageEntity": {
    "action": "Save",
    "entityId": "1173516528",
    "entityType": "Track",
    "nonce": "0x5c490bb299d65d6dbcd1587df34942c9c9db186c9fb8f4f13b0d3e704d34277e",
    "signature": "0xe8c6199cedc09dc6340e3120dcbb04844fefd33064d077e8634a0b6fa04735a70e1444005a54f7fe895ac7ff11f11a9f1346e464fd131f6696b6d44f6e3536501b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}