{
  "manageEntity": {
    "action": "Save",
    "entityId": "712289",
    "entityType": "Track",
    "nonce": "0xd8e4e26a22789dfc00edc01a1cd2c28488f82d8aa3fa8399a9338f91e528f75e",
    "signature": "0xb4b2556d9b867b037e650d492ec3a668821844009eef65b3091b4c03a4740b8753785a2598fb9e32fdaa73f667ef6ba691424c5c7c6fb43b9bd558663d7b6d721b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}