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 0x57e98e940ecdb0c2ecd6443f035dee94bf787f0b55fd4204734bf88cb5fb3632. 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/1e4c93b1-57cb-42f4-8009-09286302fdeb.json and https://artists.proofprofile.net/proofs/artist/1e4c93b1-57cb-42f4-8009-09286302fdeb.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 0x6f48e16010ee3007e134773c6a0dc6b6330846120480b0ab1c8042fd3c28f1c5. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZTAX2379259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc297ed7740dc57e7515c61429d2fcd95798a106460a0db2ac0fc2f644278e0ce. 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/QZTAX2379260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aab43abe516428fcd44f96ecd9e421c59c9a449db7482f7d741bc11870688d2. 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/QZNWX2305419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1383ec2c61a1718140848c5f813c231b38431de37b30055c425b1a95aabe6cb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTAX2379261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1a54555716a94e904d5b8f2716c0801e568a2c4301145864f8b520cb7a76cf. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZTAX2379262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e7d09df358be942d1197aa26cdbf0b33faff79af92dbb4ef28cbd792d4587f. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZTAX2379263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bd5dc1c48d734e4e28912691f6e985782c3bf2418261c4fd49180fd22ed5ec. 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/QZTAX2379264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed4b44e01bdccac03efe89bf7951df9f0f73c9359442b230fa8dd4f5e19165c. 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/QZTAX2379265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0130cc6a2b49aa0a0e28676e8961b19885b0f2ba2c92f411a24b2172b87471cf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTAX2379266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424782710d64814577f373bb3b9d69d896f0a9fa9a949526f9be7acc5a3c8233. 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/QZTAX2379267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4508216b2e51d7c428fdb86a6e90cdf051b63c0ae7068a640960d78719b7d8. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZTAX2379268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756b3218228ba535a0a0ffe7974f00943fd75a8338c0619415af7b87bc8ec790. 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/QZTAX2379269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7485d62471ae0b5489dbc9d3b97e37f83396a8375f281b7dcc56f04ef558f46c. 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/QZMEP2304557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc297ed7740dc57e7515c61429d2fcd95798a106460a0db2ac0fc2f644278e0ce. 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/QZTAX2379260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7485d62471ae0b5489dbc9d3b97e37f83396a8375f281b7dcc56f04ef558f46c. 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/QZMEP2304557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10b8f1fddcb15018e82e264ce46835bf3e0be3bca52153d7f6f847485b95ef4. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZFZ32332205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28e56f708c7be3d07c581a5bbbc04c767eb23d8ffa36fc71a6b4e291f4eee76. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZFYY2347404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa909a0953e0511caafc24ee1e5e3e885eb9e5e22b7a0cfc396ba2e8fba3ceedf. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFZ72426355.