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 0xb2c1a49aa39a466abd5dcea1029c28671ae7a226fb74094ec564c26467271002. 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/e6541386-c930-4187-82e7-f2a74036cf2f.json and https://artists.proofprofile.net/proofs/artist/e6541386-c930-4187-82e7-f2a74036cf2f.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 0x5cb50e1b8672d6526d26126ce40d3a617a2f54a9dc918c81d1fffbbe7cf6cb6a. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/DES292200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26b11067505a0ba1611258c0b51a41f00472c5f89b60b69ea3bf8c8f771b30a. 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/DES292200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eca13b87168f6abb7f808b7aa21605ac67bd252506f3247d7901b36424f1574. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/DES292200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb93a272eb8e18248c689b7cb2f934f01b48ba2d964165b96771a38a90ba70de. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DES292200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c2ba92cbee0e44c75fc04feb30f65ad5751383733920411cec0fcff126283e. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/DES292200022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47f3ae6ce9c85cd17a4bcdef612fd10601a22ecfc224cfedac3a4a1062f7047. 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/DES292200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54cdb325d23d9a87e9b9aa9ccba66292f0ea784738d8a479f77dd8af316209fa. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/DES292200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31433b0bf86a62438bbd1c8c7483a480ac1223424b58d5d7d137bf5fef2f6d45. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DES292200026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a703e170913ca8e6f8a8e6b8d826cceed458fe50d2e7281d88b3321769510fc. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DES292200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d55f514c60b3bfe61717ae2933090495c33384a74d9bdacf97cad9f3ee5f04. 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/DES291900042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ab5ed0cd2d52151f9a9fb6ace6730b44093e6814b793acc7999b6a051cf90e. 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/DES291900043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfd9e7280f6132ed1f95351452f9c585774ccb9cee3152220e184a6929b0dd8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DES291900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601b664545c495aad62d7d808a1737de49ef5eac7875aecd784b0c27b1afa718. 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/DES291900045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056d8c58b62b46ca19fda15f5fcb2981a5f511f50e7a1e40cd4a15f146af99f2. 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/DES291900046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631055689d6bc3661bd29aec4ba3a011c3de6fd65d3f96ad1448beab6e77ecea. 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/DES291900047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a27facb294ead804bda9030aaf2eb80d30bc3bede1b33737561120e2c85340b. 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/DES291900048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0862da0354a7959fe4d6dad57a4ec1fdd3260990b9044afb69bb00d6e8160252. 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/DES291900049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18bce97db8822e1b4c44d8a289061937a4e2cfc00dfbb12ed796a93997606232. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/DES291900050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd641c8f7d594a1222bf743a85eed36d9afe82f42d245511fa5e04985e1e3f8. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DES291900051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7632d5574dccf4fc68b81cce26307228d9263156845065eea792c53d5c2154e0. 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/DES291900052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f99e4ebe06985141f71273e793ab3bf84f877a36039a412fa220059dc25701. 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/DES291900053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dccf7c14ea9b7f3bf2ba9ac5b18ab23d1b3b1d52bdffdd64f9b792b82e7f202. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DES291900054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11131b3cec56673ba0a8ff6304884081da368ad6d9d695a9d927f20ab7dabfca. 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/DES291800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea97bc80c126e64966a489a88aa6178a4b0096496fd05ece565bbaa86dd39d3. 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/DES291800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e31f48ecb1ad55cdeda246238a3d51340044841119cdd5d0359ae0d15f9537. 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/DES291800003.