{
  "manageEntity": {
    "action": "Save",
    "entityId": "452819889",
    "entityType": "Track",
    "nonce": "0x10f05f7a251ab2cb45e65caf42f88b54af77e0a2d261ee7066e8a747b2c868e1",
    "signature": "0x00aab673b0ca4dd2cc1205ecd8ec1b6d1f8703ffb03317ae6466c4121d0ac89505aa12624ad766eca9f608aa585cd6f9612b69089b2e48f2376755c3f79996161c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}