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 0x511cc6f166977a9715301d7740a84482658faa556e2941ecd456e43d1e7dd691. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f99dc7b-cfc9-4a07-b202-e52e16bf4830.json and https://artists.proofprofile.net/proofs/artist/0f99dc7b-cfc9-4a07-b202-e52e16bf4830.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 0x21d112e6bd435dfd19d9d98a314ec5fdd1df0177b2df33c96d35e0e60c8df527. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6L2563271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a9a06f924b1116133008865d2d75e8110aab9a4eb212cfc0c053b2a8b058e6. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZK6L2561662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52344803aadc0661dbd187ac8a63047c8e5c3d6781d2fa625af0793deb98b04. 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/QZK6L2566669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31f2755bd8bfa4f5fede5023250ee37b6596b462d934b007db92d5bc1310830. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZK6K2505886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3abcdb3586732d616440223bd4b5487f4519ba9792db00f564248bcee6effa. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZK6K2503168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354b915b8c3e5045a1990b94c751885521f6289adfddeb6d44a3c14d694dc486. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6K2500678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d48f329088d4ade72cbd6b5b776d95e2ad440cfe531877dbbc595186bd8da1. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZK6J2511782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d05c9b0afc5c4333fdc6b07c35428171071e6f0970d9ce2a45b857f00322ba1. 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/QZTBA2501284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf260806a20e9ccf16a94a51289f584886445ab98cc998f6b79588abd65c6920b. 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/QZTBA2501298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7ef25b82d2a41104db386f818dc3c668ec63bfa4f9365db2b17b23f12bb29c. 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/QZTBA2501295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1f89b84a578644a8dcac02a3d20d12c7c12e9c475bff0bf54abf9b3d6d17cf. 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/QZTBA2501299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ed6428044234b6647753a99b5f734c903648ab38beeadbb09b43ad8c6dcfa0. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTBA2501291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4255532ef0e2c0254d67b08d4a886461661dc27211c04e7b9f7be3fc471d14a2. 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/QZTBA2501308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c372b9afc66319ad33c44cedc2602185a2e573956965121e7df359d7d5a3173. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZTBA2501301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c4a9f82db2470140789a5e9aa8cc19bc40f99d5114179ae2ecf1ca6820a81c. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTB92599545.