{
  "manageEntity": {
    "action": "Save",
    "entityId": "646575832",
    "entityType": "Track",
    "nonce": "0xa957d4912b68f39f456cad58062bd0261ed1245c40e83e956cf3533964ca9323",
    "signature": "0x1c53b6515c09496b091e563f8016638bab01a4d7943587e2e905de2a16a0396b477b70e4b0d1b6cb830f5740ce3e55a42f30788d1aa8de6bd0a090d2104be5fc1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}