{
  "manageEntity": {
    "action": "Save",
    "entityId": "477185",
    "entityType": "Track",
    "nonce": "0x4d769572d1471859950aea705e39ebc0e3319d7ec3f690452708e784f77b083d",
    "signature": "0xe095102f4f766ab44900ed93a85aad4f02cc97f59d29c64f2f32b05e93f5d8d90a269273c8615e38c052fda8ae3268eb802f0a19edf507018a5bdaf3e46cb2ae1b",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}