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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348bc5e7322726a4c3035e8604b58b1ded7c5d17b637d404db549c638a8027e4. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/26a67b39-f0ea-44ae-a3e7-c3222e3e7c8f.json and https://artists.proofprofile.net/proofs/artist/26a67b39-f0ea-44ae-a3e7-c3222e3e7c8f.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3a9be9e58edfd7a8ac352422fcf6cccedb0b72fc9265f3fb74be240c19b941. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZFZ42140722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4291cc3a6860d427260bd11eafb3811fa0e74a4dc11586cd6bc7e24b4bbbff5d. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZK6K2214329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e00e5341d9720d1b6363ff5432d2b4de3d9449149738eca53332ff48cd24165. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNWQ2258974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acc8bd7c07ddb584566f3a576b0ff4ee11652fcf0c45abde6c6dcd94029f4e4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTBB2214422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b8f516df0b0450d7d390f01295e772f8b9ae3bb461d6ef7b53831c21b311f0. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/QZTB52318583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a4fd3ac42c6ec6ffb3e0f3a994035871c931bb8a0da7337127728be7d0de97. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USUYG1540162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0dbf1ba7ed0c1326b7d33be0d27dfd5833318fc16575fe12b321498da4e1d2d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QT3F42436905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19d1b44add56d5333251758bccd0547a59cdb09518db240093e2ac0374ce858. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZDA72532109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1504a1e0f01f8f242803af4828c412402352aca37b8c4adc84a62c78d2f888. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZSYP2511781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc7be1eab605cf349f0267979f41c87a9dec35671e98b08ed47072892f4921c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTLA2523738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef1b7b0a1dcb3d7a005b69bce33c0969b3921437297db80c29d47b22f4136a9. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZTLA2550904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673ce49cc57ab6bb1fadbfb43942b2b7216de9b855695b87e2771db094190dd6. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZS7J2552530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9066e49ada95ee234f76d82b33ad1dde28b1db442b98684118100e8367cf2f52. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZQAY2390712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979f24382c4c58341413b4fb182a4ce19a58b602f1690833d79c7bb0f2da0c8b. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZK6H2208304.