{
  "manageEntity": {
    "action": "Save",
    "entityId": "1474288224",
    "entityType": "Track",
    "nonce": "0xfa0c2ec3a20add6eef777d272dc7616535cffda86806be08131effe3525ea3c4",
    "signature": "0xe3042dfd995a79418f184b22dd86e062ac9357bba944d77dce763d3d065f63d03bc417c3bd3d12b1fdad2b219343882f94009927b87fcb3194a77d06a2f8a9581b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}