Proseis (), also known as Prosenses, was a town of ancient Arcadia, in the district of Parrhasia. The people of Proseis moved to Megalopolis upon the founding of that city in 371 BCE. Its site is unl
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646fc958f6bb44dfb0524cbe1eea6bf4db95357e2e2dc9e612487b51cb8758db. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/574b84ad-35d6-40ec-a406-c5f26b98b288.json and https://artists.proofprofile.net/proofs/artist/574b84ad-35d6-40ec-a406-c5f26b98b288.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).