{
  "manageEntity": {
    "action": "Save",
    "entityId": "1857757394",
    "entityType": "Track",
    "nonce": "0x2f474ea243d26ecaf32885f800cc6e228eecf83cbefc211d75bd5cbf72bdb577",
    "signature": "0x00bf08da5e996b83921d509bddf83130f08061cdd11ec120a0deee3055a115752d294430ca861ed5858aa0168a5c9f46b96e14a1f7a1da2df38c17ba4a2d94901b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}