{
  "manageEntity": {
    "action": "Save",
    "entityId": "497124",
    "entityType": "Track",
    "nonce": "0x566cebd2af2689836a453c16dd84d6490b4d0eaf4448601a784eda7966dc61b8",
    "signature": "0x350347b25b17ca49146c87f9869f3b54e44abb0ec78d14f52e7ed455a2ab7d3563da38b71e51c5519c2903d2856802093fe117464c75b54022f65fa53da7b6841c",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}