{
  "manageEntity": {
    "action": "Save",
    "entityId": "136954",
    "entityType": "Track",
    "nonce": "0xcc646a160db8832602ba6847294ae6c21bc3a7e8e4afd5240ca90a971d3b4e52",
    "signature": "0x014d78cb98370e7cdef12c0535c772bc51a2ffe79e2b2c8375e03c6c0088134e01b14eeab99670e5eb8ced945772db2163419c9dfebfe630f1b3454be59089e91c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}