{
  "manageEntity": {
    "action": "Save",
    "entityId": "643215143",
    "entityType": "Track",
    "nonce": "0x64b203b1989c9b3fbaea75d3a77471be96806ec26977ea90f717885ae8710e60",
    "signature": "0xd9406e5d8cd49582141c775d879f28ad76816b4c1e0900b37101467419c1dc642d82a3f7adc356d9a69b6e4ee72e375c66af2709a2c7e35e0532c6376fe5c09f1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}