{
  "manageEntity": {
    "action": "Save",
    "entityId": "644475873",
    "entityType": "Track",
    "nonce": "0x89ef221b7a40f67a49d66c128a3dfa6e8ea09c0c34dba5b4b83ba7c04c77b35e",
    "signature": "0x8c46a257c385e6d51b7924817b07fa3cba7e0f8ff521cfaa56bbeb5f5c97ae712de370d468fb47e0ed4134bf9ca5e9e8b5c6d441e801beea059d4c71c58b51c31b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}