{
  "manageEntity": {
    "action": "Save",
    "entityId": "380015888",
    "entityType": "Track",
    "nonce": "0x91fbb57865c633636fc64e46edd8e11012768032af91918f9c04d5a55952efc7",
    "signature": "0x3a9e8e8f8f598109f3ba106495455f40748d0a70ee7bab62409f39a033306050417e5cf1b8920f85102bd80679586af9caa4406ec5ad2c5a7f1bddc46a5554281b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}