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 0x46dc7d9e2f816eec1d7df56d435c44eca59babd65b8db748dee761563c0e17cc. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6eaa26a5-9e49-4766-84af-1e04af2136b7.json and https://artists.proofprofile.net/proofs/artist/6eaa26a5-9e49-4766-84af-1e04af2136b7.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 0x62c7dc9aeea13c4797d247cfdb083ddf51a4035e3e83e71b58c4c12379beb9c5. 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/FRYAS0526360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6f368e85fc23c3b7e47b43287f0a5ebf3409c4f071027c03746758274c7baf. 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/FRYAS0526370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd56e0c1007430c8b156c84e4df26e20e7dfcdbe5b2c3c63bcb167f5e36c4b91. 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/FRYAS0425580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310ed0bc4b05f603c21d3b58d74a09495b47af06fd95ef9f32c0529572d62e8d. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/FRYAS0425530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd85dc83b17d26908558933a6a52c1613ee24a727a20f36987fce29df808246a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FRYAS0526430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x075ff95567ba740c672978079f4ee6e9aef90414a9b8905d20cc6128fa792030. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:00:42Z), 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/FR0Z51000644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe875b47ffc4ac42ee0210d9e99bfe771f099543d4f5e61e112a701aff416c527. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/FR0Z51000648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1f7b1c65294137e53874384d9f1869ebc95ab7450bcf154684b23dec5a5d5b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR6V81662635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c420f7711e793445d15e8fc0c54beec7e01abc66c5146833e2b9c580fd02c70. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:42:57Z), 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/FR6V81734600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960abe460889a6eff2571fdfa5b5d611c4021083087c8852ae7895112cfea0c5. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/FR6V81734606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d531f878742d49b322aa46bf6b4dea9f2cdb26e05da4bb386e91cb565edc09. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR6V82384422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c7575ece2b9cf9e3fdded339c6b97bbc073149ca10952a772368b9d19f3c1a. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/FR96X1756633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2bf6229253cf5534ec02f10aeea417e396bd01b1468623a13235117a5a7bff. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USCGH0806776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834ee863b3346bb35081872927d98076cfff9441193ce7836a5527dbfe6128f0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR6V81738423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490869a0ea5c3893cfb5083703335b0dea1e761c2b64ee3e7f3c53e30f924f89. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA371024326.