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 0xa70f9198905659506c3e9ed438f425f3ea2a8f7aa1a8b50fcfbfaa38ae2ba07b. 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/403a072d-9cd6-4e7f-a7ae-0209eb3afc6f.json and https://artists.proofprofile.net/proofs/artist/403a072d-9cd6-4e7f-a7ae-0209eb3afc6f.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 0xfcb81f0f5280c3163ec4d7eae9cb1d8d1c39ec78135feb6ba52e461d04859d71. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/QZMEM2210812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbeef3c25eafd5c0300a7edda61747aed69de1cb1b3a816712a6f0e489681b6. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZTAX2239750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529052a91c760c987e691e53538cad9d66feee5abdde2439ebbeb3042e592542. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTAX2239753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ffacf355c9f29882d4289f1e338970bcb4ed93ec9339e944594903612eb0f7. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZNWW2323347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5ef9cd2c2e76d215b184126eb44ab8e739696de27459544a25bbdc00aa4d8e. 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/QZNWW2323356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22ee4ce8791413335d34914a236c4cd992dd8790748dbc30e6ae3fd5dbe8913. 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/QZES72423305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da4c2e9f992bfa103d67fc37e2c81411de59f30bc894ca1d7d74fe1fca1dc39. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZNWX2423309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf292297124c119ab7b84ea67a4d5de0b575a63aa2eb574a3a77838c299100e. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZNWX2423311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb4acfd7ea584ed17a088830ab0a4e7e40501bf4ae3056a9ebffe4f340a4f1b. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZNWX2423312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3195c2c96a6c0c542103407bca73db90b776fa350e34229143a2586b70c7b0a. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZNWX2423314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4033b125c647ef14a88ee16d6f5175c593b12c9ec9db4498769ed0410d5d442. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZTBC2435607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1f4448b14b38456bcbae548ed0cc25793b9e4a99f07148aeed6c42049c0f73. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZTAZ2552602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f8d3cae3d75571b5371b82c15809ed34c671e885583ef3de01921fb2ff10af. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZTAZ2552609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1727b299d111cff8ea35a8abb183f82d5fe08f70b0a1f7b6a4677426d848362f. 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/QZTAZ2552613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edb4899ddb5defc4395e92435ef8cfea0e32108882712e2d635121245457a38. 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/QZTAZ2226987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770faef1b758017010a465c2371068cb0d2834634be34dfd4953a9b1c9cf8440. 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/QZK6Q2361485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95c76f57b1fb88f28434ea0ccd6248f45b2d68982208ed0313250590a56f754. 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/QZTAY2250860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97cabb99c16fbeb39703954b0932be43fee102eee4a2f7fcdca16ebcbc8e7f7a. 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/QZHN82236977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8af597a1ad33fa7e4cc6440fda23a158dc5171877cff3b7635da5e9ca9e5e5e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFYX2274640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6e376772e93dfdb3bc3b26d7af498e72e6934278d0cd558ad11a38a66c1049. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZFYX2269943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea215c67b6034ee69f015d1a7558f87f57170081b91a9b1c90943db5bc29e0d9. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZES92189844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b515d198026578b2eeeaeac7fad919b02f36bd29c2efae4a66c7c0702041af8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZES92189167.