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 0x58a39ffc12e788d73fc1c0594e2ad02a37a87e4dc06f5ba7f473c8d962778d97. 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/6c5cba42-e0c6-4f41-b25d-241f198250be.json and https://artists.proofprofile.net/proofs/artist/6c5cba42-e0c6-4f41-b25d-241f198250be.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 0x86b0a39c425c615c7c756f6609bae1db820ef12cf451de78edfb4662f3cb16fe. 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/USL4Q1747665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6b98e02e702033e1fbdee49dabc4102910cb327f78f3d09b313dfa6d9b7ea1. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/USL4Q1747667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d9fc14c8f307414098e968a061e825f53a1b1c8cf341a9edd2c5155f53560f. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USL4Q1747668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219ab273ad505a11213a0a6379f3b77f9afd0b11b172936f2b77c3abeef0389e. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/USL4Q1747672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ecc25419774ab735801c0a2d173ae43d1f7d2ab8c38b6e785e88e44da42f22. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USCGH1402343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ae4cdf704e974a9e6a31bb20d97f07f4710c93867b53e55587bd1107c9db47. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USCGH1402344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6357c9d3181b497380aecc12fa72768c07af605f69c4c48b60d6cc34c24e804. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/USCGH1402346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7f544958414468d8c6e3284a2ebf42acc76ba05f3b42356be0d8e1b0841649. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USCGH1402349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82a31c9a4b2fa79d4747766c72a7ef138be21b0101210da02f07d63fe9302b2. 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/USL4Q1751475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9aead658f78aef8ff64d377ec0b4a4875a91c9c55bf6e87daf5de98a514543d. 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/USL4Q1751476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a654b10fe907c6b06783d12dcf481e9ae3fb1b7e49a86af156a473739cd0a7d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USL4Q1751477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5079759d965e2658abd1c6ac2809d7792ab022ddc5e953c55e4a4584459e683. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USL4Q1751478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd1b7e9edde340495b6174f4c7fd2a0331283add96c195429493efbf4683703. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USL4Q1751482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9bfadf862ae0f9e03213d5898bc37a01605fae19ffff33ce0c4d0bd886dd80. 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/QMEU31721794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2317f8c69743af22fdb04a86c8ee3166e91f3d242e225de2f504af612a7f89d. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QMEU31721796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ce8655920d5008e41bc02d04d23a025801646750c82574aca2b1fa7c466838. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QMEU31721797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972f343bff1b52dca185ab3f26ebaf04af2fadb146128ea779d4bb6e50b16f05. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CH6541788605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98c28e058ebb0552ced64b2a7e20837bd35987c02ab2a11f7f80b6781e9c960. 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/CH6541788604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6032723885cede54354c326e19e3defdc8d9642d67cb8f1046b6643f0318557. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CH6541788601.