{
  "manageEntity": {
    "action": "Save",
    "entityId": "950323",
    "entityType": "Track",
    "nonce": "0x58b873f26b467b5d35dd0e7e03bb690f1bef22318b976e309060ee700bd16e3a",
    "signature": "0xd9dbfd40e5024bed920bc9c1272b9f8ad9a8cdb02b786e603ac4abdf85ba29a823f4749fd5817191c93773d2074f9b1e1f6795e686c6e2c48cefec40c70c68021b",
    "signer": "0xf779BcA849143E9A1aa27C324Fbb01Ce9748a2df",
    "userId": "824607707"
  }
}