{
  "manageEntity": {
    "action": "Save",
    "entityId": "490883893",
    "entityType": "Track",
    "nonce": "0x58b5c6054ca8331d9db81befae259d71692b82fc3c3e9167fe9b521f1e477445",
    "signature": "0x4438796aa717f85f187d961c91439e350b5d022d4e1ec3cd4cd5190ab78634eb3abe225d94169617eb9ca128abe6129cfa5a23f6c94aab3a2386bef350c842e81b",
    "signer": "0x316933E449A0b429014E405447c447C9Bc472bE9",
    "userId": "451684863"
  }
}