{
  "manageEntity": {
    "action": "Save",
    "entityId": "447092964",
    "entityType": "Track",
    "nonce": "0x5921d1a2f11dcfa9e0283acf079beba441ada44867283fe74d3d73ccede467fa",
    "signature": "0xb706fd8265bcb55fb3ee3cbe9a4ac7f7ec281d7e5c8a285934c78461e8c50baa04d8ea00f089094fbd0e6ba4410174b789c2726c6f2be354a6ac9b777e06b8471c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}