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 0xd8d68440e8a7a57c879344bba60f7a9fe4bb71a94f8a4590b9c51040b03dd459. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ddb4480d-1c84-440c-9e09-7ddd89b5f705.json and https://artists.proofprofile.net/proofs/artist/ddb4480d-1c84-440c-9e09-7ddd89b5f705.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 0xcd711b49f5c258f648fe0b911940a866dbf3a8381bbae0f623954409d2191ca9. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/USCGJ2299813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c316529f6138a0bc6714c22cbdbec1922bc376c7a2ff2c05fdb518dce5a9b1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM22276201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4478e3f81b5bddfa1740e60878c80b4e440eba4e7a996975b4cf9b977c271bc7. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/USDY42335668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da9d295dd330b323ca32bc180be43d199b998580d3903b40802599b90d9fc0f. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USDY42335669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6239d49517258cd9d4291cc51db670c186dd505186dc398feaf960ad4f0808. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USDY42335670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a75a828ee411a45f1814a4f06fa81241f29eda3b256cb1f526fe87dad6a58fe. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/USCGJ2482710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x530b2bf754c1b54cd21a4d2449df852b921c15b1098763203bd2a7aa1745433d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USDY42558463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ed1825211b1afb54eeb2ae11c6bde4930c85961d8a1ef1adec78bb51a14073. 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/USDY42558464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5abd5f776f4922a90cfe616769f02a8f861499cd0e38de9b7ec67651900be4. 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/USDY42558465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678f963f5064c5888b90a656f87faf6134797f29354e4adb12e24171ca1bf3e4. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USDY42558466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b565ec0773fba8cf293f73efd24c734c73589f76a2a1e70acd7627870c810a. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/USDY42558467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5d28dee5163ffb85a8f0f78170ae06c9bc4da0360918534979292acb99e531. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/USDY42558469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ba54e2d567a6e7a4f458d0895f4b63af94611f71bc32a46f8041da60fcc80b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USDY42558470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a53d1c71ff9dffd23ab9c444ef2e975e5fc20ae465caec34fa73b285233291. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/USDY42558471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9408c9e5e847fae29302decf02406ba2998a07158b10d5c5c09e387df4a736. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USDY42558473.