{
  "manageEntity": {
    "action": "Save",
    "entityId": "151633428",
    "entityType": "Track",
    "nonce": "0x30530a631d257b10f7c944b0d74a41dc87fbb851eeb1f358c284b9f450395290",
    "signature": "0xbf69893bb8e970a6f58e4071caf5dc934a48281528ac02dcc91a43775d40539e0d5b288eb5ccf5b10be1eb6a698cc72b3a6605d6a9cf23b8ec43f3b6edf07eee1c",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}