{
  "manageEntity": {
    "action": "Save",
    "entityId": "550090644",
    "entityType": "Track",
    "nonce": "0x54df62d6134e5b4dd9afdbc567dea71b28e4eb4103f2e71a11cb8309b051360a",
    "signature": "0xdde27cbfd6b8ff23f9245b02af4f60997d181b7495d2cb8e59623f8ce75dffaf0aeb7a609e66537e575ae0f6f59b8cd105b07e418f332babc1e7f26d64a51a1c1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}