{
  "manageEntity": {
    "action": "Save",
    "entityId": "728424",
    "entityType": "Track",
    "nonce": "0x59e37f13b92e995f2a1e43394b97c5aa04686546832ecc38a376d604c16dc383",
    "signature": "0x492c6d3966e2180cd4abacbe6798aa740c199f6b0479b5c2c640fc71906e8efb4010e614445ccfb213b527fcf7078d76e5c9856908ce3aad075b07d4b76c2fa71c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}