{
  "manageEntity": {
    "action": "Save",
    "entityId": "689617",
    "entityType": "Track",
    "nonce": "0xb27b960b0752bff0bef1bffb841e0c3bbc4d6dd75f9c0640b50847da19fb21e5",
    "signature": "0x4c9d41defc9fb1c3771d8269a5ed83eff7f8edee5e1300bcfc8a31cacdae6a47540a1ac7891712ea85d1956a8ac585af97387b0df1af94ecf579d5d7d170e2a41b",
    "signer": "0x102a924C1c076Dcb5816d20E32Dcb6F00e75F2C9",
    "userId": "485987672"
  }
}