{
  "manageEntity": {
    "action": "Save",
    "entityId": "525514299",
    "entityType": "Track",
    "nonce": "0x9a47d8086244fc102fb4f7d92277e3461e77ca624918da0c7f0632863a9a4a6e",
    "signature": "0xb7258e2c6ecb8233d93f940b4c6c4a4fd76557c2b4b19a771361efda4fce7fef46f238bd11de1500647dc9343f3f0e7f7e8b2ca797156241e4662d45f0bcf1081b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}