__NOTOC__ Year 289 (CCLXXXIX) was a common year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Bassus and Quintianus (or, less frequently, year
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 0x4e8f1688be7b137e8a84a857105a8a5ee940d94a2d50e1dff6c55ff0a745697a. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eacaaa92-6788-4ca6-9bba-156f4a4135f6.json and https://artists.proofprofile.net/proofs/artist/eacaaa92-6788-4ca6-9bba-156f4a4135f6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e10a8b52257b8f184b45d2db631edfe842c6632d74e0deee33e07c08ed5293. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T07:08:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMER2190698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b261d1f6608bc572d53795dade3ce01fa6c0f6886685f3cd97aeab094b57a12. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:48:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES92526395.