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 0x2a196ba01c31590e9fb209b866ffb471bdad022d05502d09642bec13ce32524c. 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/bbe6c432-0291-4ba3-9009-a1efa7bc1da0.json and https://artists.proofprofile.net/proofs/artist/bbe6c432-0291-4ba3-9009-a1efa7bc1da0.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 0x529951e56dd0ea76a1b117a80079b6acd40db367238f825b60136ccb02cd9019. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZES72168924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb889120dcf3b451954c30f5e82d2949f99c94fbad4535acd6de2453b9df6a96. 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/QZMEP2115755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b7c6fe12189c1bce24f31af7ca56b81f80ab2a9332689da31b22db2490aa60. 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/QZNWQ2158546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7dd6cd51cc7093c681a35b5dee8f3cb80659393452df753c0f3603f9546923b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHNB2256590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde1c4e11cd33fcec8cdadf94999d4fb054b8226f6a3971596dfb29c04a7b26c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWU2200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91144f5feea3b888161d278c1ec529ad6dee2bd92e637e8cf029dababfd8cbe. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNWU2200172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981bcf2ab28c3ab6458619927b766564aa7b9f416b63def3bdae072c04354975. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZDA72386458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671e4861df6e02f2346c07a0ff88ca825a7914c9ea578642b974b4e0eb384481. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZDA72386459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17047bdb6ee45e8bb5b52d51cd94fb4f52c2a1b055705886a8e06f6094f59b8b. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/QZDA72386460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d48d217027ee4afe034bc5d301f46fc03d1f08e8b34fbf8c7055edd22855c8f. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QZK6J2332056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe711d7dca3b50ed9b437a59e2fc5236def6e1b57cab2654dacef35fe8eef5e5b. 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/QZNWQ2317147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981ee95454bbdd25697b00214d7d9a5a4fa1ba03b04aeed641661274d5c3fb0a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZRP52388636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa457d47f8bd11c310e9cad7e77aa29d685638773eec9f0f0288caf53c4ee88ed. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZTAZ2493340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38339cc15c800a72c0cac08c18a79893d579cc08daa2ffa478d87a3eb3b532fd. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7K2464994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fcbf1057e9df84da172d7ec8cd59efa02fbc21d2d882d77ff6b9470903f97f1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7K2464996.