{
  "manageEntity": {
    "action": "Save",
    "entityId": "21247202",
    "entityType": "Track",
    "nonce": "0x61f9e19ac4febfdcd1f0a9f5c8f0e2a0bd33bc80c4c680ad22a66acc5ae99cb4",
    "signature": "0xbc8e2eeca6b274977d6a272775ea7751371a657341f0a9f74159c6da938c215a0efb885fa4e2acd15bdae2b9bc02b30210ecba40c63c9f88b3bf16550bb740871b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}