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 0xd0c9260e312fb47b8d442b1d2341595abb56e8dd8eb97b50d9c7391d47d99dab. 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/2db18973-846b-44b7-84fd-5465c3e9ba7a.json and https://artists.proofprofile.net/proofs/artist/2db18973-846b-44b7-84fd-5465c3e9ba7a.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 0x12655483ac021492a08672d9a5dec021c52938e4b8716d8130693c13882324f9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6F2096693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8924a3a64a149e6ec4abf9f3c2ced0a5f19ba5301be3de78584082c1bba7c53c. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T18:05:40Z), 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/QZFYY2396813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe115cc820e1460342b8f47b9c1c7e84ab2676dbd6a1bf1a6a75020b809a932f7. 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/QZK6M2393525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e90be16206a7f0d098f8f27855e599d3c09d07ac0de57012997b9220138f6fc. 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/QZK6M2393535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd742d3576fccad35e3cf56c85934679ca8e93c5d55da5cfa2c63c9fbabc6eca7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:39:50Z), 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/QZNWS2211187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1076724cf3581fe2e3d74b87edb74d6396b231175304638b0b7bb4855eb1ecf8. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZK6M2393538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570ca4645f498e32454f09047801c8864eed8f2cb1c1c5d370917c182e9c07a8. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:43:19Z), 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/QZK6M2393539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787878179b13b347b8b8a2772496fccfa458eff77d40e4e35220142d05fe5856. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCAHO2363276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c41ea079437b743b6d3e04c6244821325f32c202795c6194b485104df71bcf. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAHT2453137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2803f2f7a7430fda7648d8dfd25ff4c763a142fe3479d37612dfeac97fd3030. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAHT2453280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e6d63b9cd338aa893019dee3a2f13e8e91d169d607810f352ed309ee0324d8. 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/TCAHT2453338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a520c3210de646b811808455400c72e09440be2847699a4821a5b4e7fe9b6b. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAIP2477093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b897c21f9ef4612dc167f0d3b2839d26320154175590c96a22677a17b53459. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/TCAIQ2477221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ddf95c1ffc92b2a861cbeaa61804bc9ed7d09361ff2ed7ccd76fc7de5782ac6. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:32:46Z), 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/TCAIP2478352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d167974d835ce922aab888e789708f2e47aa2d3ef68c171837da6aa008cfb23. 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/TCAIP2478388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576be614c6661db179089f716560207845590240d36418b7d1e411e507a4e3a6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-27T14:03:33Z), 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/TCAIQ2478399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf15a701bbc4849bb2ce327543217885d0d2d7e09e56796686cc989c5bfa7228. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAIQ2478412.