{
  "manageEntity": {
    "action": "Save",
    "entityId": "752650583",
    "entityType": "Track",
    "nonce": "0x9f534d0f8a384da63118195d52072658c9eb9a41637f1352013082ca9b484445",
    "signature": "0xd643ba579e15682c2e29f3f234b37f1fff12c13b99c05dc0c623cdb8ab47262f60ff9902c706f720caf35a124d6da98f166d92e7b8f620dc36d3f426d6d8713c1c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}