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 0x03af4a72df9d81ed6880e68b1dd3f6710be2f6a4947e8ed08b990a24bc354806. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ac12ac5-e9c4-447b-baa8-8a08fcfb6a7c.json and https://artists.proofprofile.net/proofs/artist/9ac12ac5-e9c4-447b-baa8-8a08fcfb6a7c.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 0x99c2cc29f865168bbf669f296f63a5c8cf17fcee1f22604542449d8eee079ca5. 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/US7VG2179285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff5b287ceccdc45f4e43f3801c0edc456167e307056482dfedf78bb7e47a797. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BKTJU2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35791161c2ec3e935ea83f06bef0fdd643e70b0a6938ff1a298001839d3733fc. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BKTJU2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef2411e1a585c903ab8f946b3eaf10c2bec7340dbec6bf5b53eadd16c4a8c1a. 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/BKTJU2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e42b63efc669ea8ca1669859a659807be818b74be3015222872195b0735c2ae. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/BKTJU2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1c94569951de4195b31196a9a9251210f4e1ee3899ba72f9aef9495255a17b. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/BKTJU2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b57a1ddedb7510196a16b54f8cb7513f3b873af1dea5b0716336dd4c92f82a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BKTJU2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671eec5312d0458460498c9b71bd31e8d662ecdf6ccd499f4aa944916dd76e4e. 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/BKTJU2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c84a05985bb49edda19fdb867d3bc75a978f2baf647cee19f317f9e0e329f0. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/BKTJU2400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35791161c2ec3e935ea83f06bef0fdd643e70b0a6938ff1a298001839d3733fc. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/BKTJU2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf987a465264d9d8e5021eeb535111e428752433a4d325d5164215b20baf9622d. 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/BKTJU2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebb4b370b56bc0f12797590d0ff898ca4f5b2f35240c077510a4a426b482553. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BKTJU2400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80729e5a6ad3f8d1735e92c2a61b68eff640c1069a0c691b9317043e4ebe01d. 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/BKTJU2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9df4a73533f45dbcb804ad1a10ec0680e4b1399690e16ce7c4e08ac23a92d34. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/BKTJU2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d799f918544ca40f72129f7d2d209ee3179b4a57071dc9cc03451a971f28db2. 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/BKTJU2400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671eec5312d0458460498c9b71bd31e8d662ecdf6ccd499f4aa944916dd76e4e. 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/BKTJU2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f8c8f95b7ad1d199bce04c875bbe31353856fbfcaff8de1766238ce6d210ce. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/BKTJU2400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53cdfbe2d6669ba169f19bd460db7acd74853f6c94612759bb863ac69c371922. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/BKTJU2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1535774127207631dc769440b5e80c43d339064fcff61bcb8d0539cf4daa4397. 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/BC8TH2300013.