{
  "manageEntity": {
    "action": "Save",
    "entityId": "237149",
    "entityType": "Track",
    "nonce": "0xe1c18bb77f8313c134ce02bcd30c9ffb02f9219c9c8f530b216526d741977469",
    "signature": "0x60bb3317f8d211dd8f333bd039f18a6810c8f952541b3e3089c4f553f8c0941b4ac07290eb7f053b1f8bb0b93d52f3a70799f94391feb270bfff2bcad938ba371b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}