{
  "manageEntity": {
    "action": "Save",
    "entityId": "764699272",
    "entityType": "Track",
    "nonce": "0x914b0dd454e944a6fbffcdc9b7fca7346d13f6739f8fc072519571686ea99bc3",
    "signature": "0xb661344672cd55d5b0bc1538e709ee1c6d5d0f5bb1553fa9616c6f22b73f18643974e3c90a0fe3a0ae9318747e86c1ac637e6c118305e989b4fe62da8d2ca4a61c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}