{
  "manageEntity": {
    "action": "Save",
    "entityId": "757593697",
    "entityType": "Track",
    "nonce": "0xf9515de44e2b058c1f61f1886dfbce3f8ce82842d97abb8ca4d86d038a343eba",
    "signature": "0x15c6cb977a055cd71f7b43074b887479f5c1e96426ad1dfe2b0f842af7c594f44e93ccb141a0b4250e87914d491e106abbe1f3f628d20b0d3b2609dca54f70741b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}