{
  "manageEntity": {
    "action": "Save",
    "entityId": "1913667456",
    "entityType": "Track",
    "nonce": "0x53e5f4ab840d1deb1a673365173d630f728f1aea094308023fd5adf048c4b301",
    "signature": "0x55375a1fb2a67c0d39dab281405fafbeca56694faccd8e92deb4cca0163eb30b422e930be6d9c9b278df059c3fcbef0d5e597e2cc8dfd329843afce889e76e201b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}