{
  "manageEntity": {
    "action": "Save",
    "entityId": "812929752",
    "entityType": "Track",
    "nonce": "0xf440da1441230a8ae3bc7939f76009b32be7dbc0717e50892e3e50e2bdec6c65",
    "signature": "0xd959d99e7cb6bbba057e0b6382374e62652ea2de0fbdc2ad2de46ca64805d4627c6314ab5eb4424d0bd6fbd0563ea6557d9c4fdc7285b525732ed7bb2ca9ff771b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}