{
"manageEntity": {
"action": "Save",
"entityId": "121321",
"entityType": "Track",
"nonce": "0xbb14a97e14ff0e3176d2587ec6f02ab4764f247ed54b93cf5f0cf76761777519",
"signature": "0x0e66b4838899644cd67070b03e2d88534254515e8394b9b2e95924cb0a4b0f710c5717a32719076d578e447f38c47ff2d517bccc2983f8e098c550cca485073e1c",
"signer": "0x15B9643abE09bd37C52a5BD1dCF938B05b06cBFB",
"userId": "370091516"
}
}