{
  "manageEntity": {
    "action": "Save",
    "entityId": "1144732778",
    "entityType": "Track",
    "nonce": "0x4ebfffa1f9fc8078e5f90e18e8f9122d87de8307d3d83dfcfdc92c1e65dd49ad",
    "signature": "0xe9523886cb860e91a2aa07aa32b1b65cfa5762ee0ff42bd92bed5e030a767f172fe4d5e9107ee5356afdbdcf6a9eafab9bf90f270fe0dd3fd5c324f3244af5d91c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}