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 0xf731eafbbd084b866938d9b89ef1b2de067cb2fcc3fcac2dca4f95365ef05612. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20424597-eb64-49cd-bd1a-595ab6e9102e.json and https://artists.proofprofile.net/proofs/artist/20424597-eb64-49cd-bd1a-595ab6e9102e.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 0x5b8a7a505b2f298a2dbdd08c8884aa8fec9159a51244092e3911e4241eb900e5. 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/DEWG82200269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ec891292da31cdbdf36eaa661f4963da5dfd3a9b0315e8f556336155712eca. 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/DEWG82200270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd63ccd392d95298274bb70271711f1d0b6c86ab8363dc5754b8c0d99eae89b. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/DEWG82200271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452e5678a063eaf3408ace3debc5dda8df9d17b05dfac58835c4624ebf10099d. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DEWG82200272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb202461cc96a2fffebb91fc8b2dcb567f2064dcb3e829dbda1e8b8c5b69ae86a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEWG82200273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b627c64a6a509b7459514c308ffdc835e789c4789a499e19046ba1fb073f8b. 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/DEWG82200274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc31d45cda434e2340263797c549fdcf0cd70b8b2e29b12fba19c0765253dc0. 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/DEWG82200275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb228d3789f8dcb686f8722c89d023c09cbb4a48e1d148fa0ba6aa36ddf0c4e4. 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/DEWG82200276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23345831b440fb1e9cba3a05585d6199084ba97efb7bb70721635e55bba25d61. 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/DEWG82200278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54bd25961c191e9e3fcda57bdf1d5b9bf008afef581d3fa19828eb75c4b640bb. 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/DEWG82200267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eaa5a17291e199b4d68cb740b6b6206b430de31320afe413eb885e70e55891a. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DEWG82200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399d4719618beb5186ca7909b49035cf0ae572154b6028f7a803ee5159bc2059. 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/DEWG82200171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ffcde35507209a33120d6c6e5cf04ebb4905dc90785eaaebd968fbf1d6a514. 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/DEWG82200172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd59fd04a55b2634b1f37d61d0efea5569b2d7e6b36ed431a191e30c32231347. 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/DEWG82200173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc52cc0c8e2bf081082cbbb4e272ad53fd33dcc127fa1b5875bc9b6f4ccf800. 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/DEWG82200176.