{
  "manageEntity": {
    "action": "Save",
    "entityId": "293644528",
    "entityType": "Track",
    "nonce": "0xef28bcb07252bf40ea3d7f15f76de83d1b584837b0fcddf55f38fed7cfb7a030",
    "signature": "0x72797f93eb8b2d1036e558e5f5b1e8292ea02cb94a63b18c58f14cb1805aa0eb6d2e12450f1b1c2ef951ba4898e747b56aff6a98e9e3e1748b4db4e02a2114931c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}