{
  "manageEntity": {
    "action": "Save",
    "entityId": "1479378521",
    "entityType": "Track",
    "nonce": "0xeee4060460301f2bff8d3825adecc63b54319c00570d8cbc3ff6d019e7602f21",
    "signature": "0xd4b6d383420e5979d57af50bf393465e00154b53fd222fcfd8b05d21529da2c6279dfd913468695603128279e9a065e19cc8f0826981e44a300704108ccab2701c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}