{
  "manageEntity": {
    "action": "Save",
    "entityId": "391221191",
    "entityType": "Track",
    "nonce": "0x0b675c613bfe26c524459f30b53e67926f4ca34dcb56dc85a521a90d98b7ba95",
    "signature": "0x4e38d99c00ccd5b87a11b860321e1e25c795b0f899e4c4368d1eebeee9b519277ee6900d77fcd77a01458c25418131a020164401cdc1a0214c71eaf3514a000a1c",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}