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 0x36fc2d46f521c22dcbc82e4dc08d2495982023e134d2404cfee5815841f39dba. 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/57019b08-908a-400d-8bd7-16e37eef9788.json and https://artists.proofprofile.net/proofs/artist/57019b08-908a-400d-8bd7-16e37eef9788.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 0x9cab2319c50efa1c02a46e6348171531844dc95ecf2d5d62bb5b0a63a584bd65. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QMEU31617628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e16ca26e302be96976f9e0e66d334f3202fdea60cbf9904ce68fc1c7e3ee27e. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QMEU31617629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddac4d27e64dd5cd4c4c527bf78af405014a4319f096a55ff43df3725e5e25ac. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QMEU31617637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba2cb5679e53407c59d1af6b57921364e610ffd42c3697aaaf7ce642e1fa18a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMEU31617638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc0e9373170dc2b85e4c75aa91f50b7d2a8df7d5e61d2b96c08ffeac3ad87c1. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/ZZOPM2223295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9509e30211abe4696b0fb654846f27188945597c2474c877349e57ad78a4f860. 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/BK4DA2308024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068b62691466fcd32088bbcc197c009dd257dae906d78787954b14e07beaa839. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BK4DA2455231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb07e72f3b880b2c0c4ab10218971c6ce488bf463c0dee7feb2cc66d2b68ebd5. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/BK4DA2405893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ade9c021531c691f1f484b6aa9d6385959dd02aa7025b8e1f97901c7f8462a. 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/BK4DA2413537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9509e30211abe4696b0fb654846f27188945597c2474c877349e57ad78a4f860. 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/BK4DA2308024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9911f65783ba58986e9eba6dee57373fd8cc43df1cf54dd0b136146f50e93f2. 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/BK4DA2455378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdefcf2cc363a1f0a906a9f1e6587947ebafe3c0e5cfff69babcb22f265b860a. 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/BK4DA2455232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd1a7d0a55a7f97b56a73605eb35899b35da0cff94bf53cc5c18d8e4a31e7b3. 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/BK4DA2321481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b2f7cd23d8aaa0775a90d23004cf8b06e59dab4d5b748006101045a9538af4. 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/BK4DA2455233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe685b92025ede2d8ae62feb68dd306c79df31018ece76440f9d769c2c1d9ff6c. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/BK4DA2426282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f0075388bb8f7506ef6740304fdb95d4bcff7b9afa91bb9b65b62b7ea32c25. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/BK4DA2455234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084437cbaef8db544b9cc9a4e7f05cb5b0d7776613c59cb12b006078d9e20c5b. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/BK4DA2541180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5eb1628eb3135bf6e975641c2b9c875a4ea0462fd76cab3b537c9b70349ec58. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QM6N22258981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38457b8efb01b1d56830305f594493061386db8783fe5616713ebddf9573afb2. 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/GBWUL2582974.