{
  "manageEntity": {
    "action": "Save",
    "entityId": "1876531558",
    "entityType": "Track",
    "nonce": "0x16cccb26b53e2ef7fc191a52ac34e0c0af00a3899bee8cb07f9e4a93a03593d6",
    "signature": "0xe90742c7935ede776d0ef49cab88dd8830843169614c363b4eb774411b45a85c301124a364b61f3de0360fdbf4343920546e8bae7a228d3a32e528e5b8dfe4481b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}