{
  "manageEntity": {
    "action": "Save",
    "entityId": "146771554",
    "entityType": "Track",
    "nonce": "0xb47fead093c26d270d2859f20d34425f08bbe63fcbf136d3eef144da560b7ab5",
    "signature": "0x81ef5a475d480ac7c918e119f377329a48f7a38dd489aa317ad42236d35c4db05fde57f5c8c0df6cd1dc8aab2585ec347555d2390f280568b8553bde325f201d1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}