{
  "manageEntity": {
    "action": "Save",
    "entityId": "489660352",
    "entityType": "Track",
    "nonce": "0x45536d335d435165159b901255343af23b573c56df5f8cff3ee658f79bab74ce",
    "signature": "0xeef6b68f607140606469617ac00615f8203b8c94b528a9631950cd4e1b68820e2f256a18566023c8ba09ea5bf0c6557732e883b5ad45ad8a0525d1f628c1cd7c1b",
    "signer": "0x34Cea527C1dc0575a5B686515aad0Bf8F3b5f97E",
    "userId": "13589021"
  }
}