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 0x6ab749b29e2b1c39a66b96cc27572413d1b351a3517da118c3e753f9581ba9ff. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/945d857d-a0b8-48dd-88c3-f517c831a0ca.json and https://artists.proofprofile.net/proofs/artist/945d857d-a0b8-48dd-88c3-f517c831a0ca.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 0x95f281f1a20c2dc29471873b05e911762f98692418ad61a0bb2b8a2c8f3485a1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN52323981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5994f954b60d93d5254e8e444c906f6aad442599283c41291906e557016f4f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZHN52323982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8990a41bfcdb6c5ef2933781fd1fbdcfe8d4fa5c28485357719a14f2a2b7fea8. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QZHN52323983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f30eed95a65462791b01ba4fb342c22f7fbe1efd0114180e3fd1de3a4ccae6b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZHN52323984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a5918e1e41cb49d55ec89abedce9dc8d57179304a50c98d9157d68df99769f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZHN52323987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6540517e99733fffc219081c48ef5f49ed5ff48fae16e4f36a784dea679796. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN52323988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44470b430fff430682f178db4d6dedb3c6e6ba70c317569f10dcc01b589a87c6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZK6K2465049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c74c6e173cd55c4b5f4a36d20b62d8f5982953d507b42ccada2c35eb4183a4e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMEP2351632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4982bbede55b5030b77d1a11f066d85bfe90b22312d42c4832fa75a06793b53. 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/QZHN72306172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ac4fd0ed737fdcacef0ada09e0708c89daac8fcddbd04ab4a821bcbc8d0d7f. 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/QZRP42202639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107324582f5c6dca37aa752aaa4d7eb786a952f563f7a1aa95fd8f3bc68eff1e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZK6J2203536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729f4e6f066015765b914c55bf15baa9913a025e8cc70ad42ad243ce86ddf270. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZK6Q2265304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc951faed193f1c44c7d00c917fff8d94233b168f4a752b588514ef16c0998c2f. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZTAT2191507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9755da3ddf06a13cc8f79bdefabde18c277ba70422591c5ad9fb7dd7cc8a0c50. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYX2234028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ba758ddc1b32b3a7064e1417450ace484c7988c94bddcc91fa1cccdb5970fe. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZFYX2234029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb2cba10476c4ec97cc9e2fa77a77c929dbb1f36b1311c52c4b9e939e0a3c93. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYX2234030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2df1597c7c59047b183505485b4e002fd543ce31817bb43014a1654a6bed1f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZFYX2234031.