{
  "manageEntity": {
    "action": "Save",
    "entityId": "723731858",
    "entityType": "Track",
    "nonce": "0xad89056651aad6a40424eefc6c347897ef68a0421edf67914507b75713fe4abd",
    "signature": "0x56480cd543ba3106b5c6dc56c5ec63c38c8d31253fd79315f52fdd61511706ad38cdf5286eca710ddcf4e8013034040191b7a6f93500aa54886f4623065099921c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}