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 0x15b14ab6c14aa9ddf4014b1bc2b3f4579e7052b772e875c5e7a95128e9b5a4f3. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe8295e5-7e73-474b-a068-15659255ab99.json and https://artists.proofprofile.net/proofs/artist/fe8295e5-7e73-474b-a068-15659255ab99.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Five Days that Changed the World: II. Friday 1 August 1834: The Abolition of Slavery
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 0xb8841c43faec81af7e692bba5f85b20ed9fb3e3b3424d795ac238e8de0e76ed3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBLLH1542202.
Five Days that Changed the World: I. Thursday 29 March 1455: The Invention of Printing
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe747ce2b96100881a8367fffc08ce3cf60984c889159401bdbf0b4e63b97680c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBLLH1542201.
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Five Days that Changed the World: III. Monday 14 December 1903: The First Powered Flight
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98efa2c2c14b52aabf926a20149791a34a95be9f78884781f3bc617be26051e. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/GBLLH1542203.
Five Days that Changed the World: IV. Friday 28 September 1928: The Discovery of Penicillin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x201ac1bf9bf512bad3678f510e702ed2a2a46e421a0d0e6f0e3820c15fb1569f. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/GBLLH1542204.
Five Days that Changed the World: V. Wednesday 12 April 1961: The First Man in Space
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aabb525623162d52bd836b0a886ca3730030564eb29a709809ce9ef20135358. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBLLH1542205.
The Miracle of the Spring: I. Where Water Waits
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63530d6de4b6459b44691d185f5c44fa639982a18ca0a674d79ea63cd00551a. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/GBLLH1542206.
The Miracle of the Spring: II. The Source of The Spring
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe98fde5507f284c5595a47795ea4544c0fe55f062d16095262f4c1c65a71dcf7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBLLH1542207.
The Miracle of the Spring: V. The Voice of Water
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9531d17991a0b6579e4f868f63fcb58d2fa64a6b1f3a4de32043a49ad79c73. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/GBLLH1542210.