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 0x3dc717e7ff3c413d732d93aa5e4546d5fe985c61a8e384507168b831634bebae. 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/4f496ff2-7773-496f-8414-f09a4e7a19bc.json and https://artists.proofprofile.net/proofs/artist/4f496ff2-7773-496f-8414-f09a4e7a19bc.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 0x0d0c220ebe0f799a2f1ee4797da690b62769d8c8ebc4ddda44db6936b31d4a2e. 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/TCAGG2298599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf081770ae509e7bcb08d5ef2ca9c62ecf7ca6f8ad926b60100fbf07e9e7c06e5. 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/USL4Q2474581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a459229a66dbe321c47f33b23a2512b7f9677ea711ac8ffb21341a9b8efcb1a. 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/USL4Q2474582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371d38e677b0680361446b3a514eab913cf26bd66fa5c85a0967568b27704776. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USL4Q2474584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe269f3aa9c1a2c9a94101b2e4e9568c823e7c6846b59b48d28fd29a0f5755803. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USL4Q2474586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca9a47fcfda8217a5877162b46a441a2a53d4bf99947e710cafc39d0d67fe77. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USX9P1409732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e638caebe6ea1fa72dfe47c3654931b91653b349244818c9f32bbdd83d04f7. 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/USX9P1409738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3168dc04f7aff9beb10c490237640a12cdf87449d39aeb80da258e5f3a76bf2. 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/USHM91621950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37894504b290eb4c2f4fa35d19e0400a4bbc8c34d7d1cf90bd784303cb49d356. 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/USHM91621951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac025085ed5328ac956b1f9c5abce3b2dcbd4a6cb85610453df3e4281c4ecbc. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:50:05Z), 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/USX9P1409686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd2c74ac0c473ddea8c3c16d89f7954fc70efa2bf45772469ff1a7506bb0c60. 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/USX9P1409688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa861158d050f4e3b507b616b492de0fe3f6bb10db81c36da190237af2a53c4b. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:05:33Z), 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/USCGH1577106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d2aad17f5c73b37ba8c0207290f8c3060e75786c99cb3510b9635f980f751d. 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/USCGH1577107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c7408137a8a45b0aa2119ef36797a36f851fe266bf2eff77ce87fe21d89da2. 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/USCGH1577109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4881af875a891c7ed16f872b4a8e9996388eec9fbff49e95be0808eda8e42306. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:33:43Z), 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/USCGH1577112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8999436bd6bb64418fb6eaff57308aab05d551efb0cc9c731da6f7bc594caa3a. 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/USCGH1577113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826c91126c807d141b127e1afb2793a66cfb69933d7a875a03fb84ed04e657d2. 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/USL4R2486246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7d7b115af94eb83f8994b39fd43283fe312519ed8ac23ac24c529c90a93cff. 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/USDY42025900.