{
  "manageEntity": {
    "action": "Save",
    "entityId": "422574",
    "entityType": "Track",
    "nonce": "0xa0ef3848474cf08aaede6137c29f0e53697dcfffce916999b32b888f78a3178b",
    "signature": "0x445d15c9ad136543386ea115c8dc9576602148d0fa6bce52da8f3f15afee844b3dc0ff272f842040746d59878c51d14d19d602d74da3733aa2e6bc3b574644271c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}