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 0x91c12bd44f85021474964874e5ff571eb038add365a1aa483117d71de6feeb75. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9f24cfd-3c7d-47b0-aceb-1d516659a9a9.json and https://artists.proofprofile.net/proofs/artist/e9f24cfd-3c7d-47b0-aceb-1d516659a9a9.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 0x73c580debad83d1c039844ad1022e0dbdf9f0a289decbabf638cc562ab7622c1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USHDH2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b12dc2ccb60133b0ec0f8774f0f4b7feeb17541192da94b86be3e19234bc9e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USHDH2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87127b9f4121509c1f9a80f6673ab2330adabc2d4c1e24a059acc71ef6255d6f. 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/USHDH2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998145a5bcba3a79777ebde4a00f409e66e7f2c61515e30ea31f490faa05913f. 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/USHDH2100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee672952b676d826a108cc6b2662663409ddddb631c27b6e355d529e7c63d7b. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USHDH2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff4f822cdca33c72dabcc8e2586b42d36cf55797dee8784c69c64449986889f. 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/USHDH2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8272a97ef5cf6e32c202f6bb717a9589e841b9c6e7ef46380bfadf4bb5e8f394. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USHDH2100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf9e64f2337340aa05f7880c3ee3e71a76ece1fdfa4545bb503c075e2c6d78d. 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/USHDH2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0952aebf6e6ab116056401f464912d12ef134d13c8ef04db6d394b12ed793138. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USHDH1900018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72676111a533291bbd708fb75008a2aa14ed1ebe9aa51c62220989a192194ab6. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/USHDH1900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76717a9ce081c7341dd86800d1707dc3c6c610de914b16beb1c892baa0bbd73. 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/USHDH1900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3297b2e1b9182553af98d8a3fbc02de9b23062fe66eb31de3a5a1292209944. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USHDH1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799513d75e736bbf152878d84ebef9f5286e83bfb21217203801e89a74ed5046. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/USHDH1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac8ee548b259bb4ed04316ce354c68314ca68324dfb4cdcd0a3c4595dfdb287. 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/USHDH1900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3750d101d06b493b369fb7f16013a0fde705d3b79a53aacef404ea82ca03a37f. 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/USHDH1900027.