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 0x2baa70809dc58d787e70561b7b1c5e390c70dab5260e384db9256c9e31710d30. 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/874728a4-fe15-4c71-955b-79129c06ced3.json and https://artists.proofprofile.net/proofs/artist/874728a4-fe15-4c71-955b-79129c06ced3.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 0x076d9d22c907b659db48ef8186925498a453a6e4debb220639e92c1fc798374a. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QM42K1969062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8387a0bbf8bd1328709378c8d40712093fab65e52d470b718568b2f0e640e219. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QM42K1916227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5c2a4ce80ae10622475211473c646bc2b6632d6439ee8604282f3f6573d85b. 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/RUA491819035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4830b7400bb783ae58f8496be860b4f572126affe9b2c8997a9dc48fe841aaf5. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QM42K1983255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3947401f915f9df23126751a3b5d2ce6183ca53acfbb71ebd58809d12a44c933. 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/QZMHK2094029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c36cb49439a65b9cf1d615a3ab7cf085b455ab81ef4ddeccc154cfae7153bf2. 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/RUA491901413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd026ff049cd1817ca1fc4d0ff61d281f35a2da0057ca2333921b59f66ba29959. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QM42K2142430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a585b05245f2ecd1c19fcca6e63ee24e0eecf80f11a7968e1080e566407663e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DGA052255559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f2cd67007e1b64ddd2f130b2826100141d18fd72d10b94d8e8b1e1aaacf706. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DGA062242817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92d1b2c3bcd58e6ced2bc949bcf508be1bdefab025ec761158d50dffdc34dec. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/FRX872367254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7926e2f025a79f7bc5855e49935ee86be5848344c5775ef0eb754cafc91342a2. 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/DGA072301614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9e95ce97a73f7b9ba942cb2bdd89a9a016840d7cdc1b70858034c25401a39b. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/DGA072236667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b304fadc560eaf0d973adb30d537442d7225328b9058e186096f3f650e70994. 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/DGA0H2459960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9527804ee6b629e764b12b63d0c3766e1399464d39351f54e394eefa6aa4280b. 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/DGA0H2459961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22c03c1a23bf3c0d9034d9438e854b149ca3cc8be9ca031b07f7fdfda7dfb2a. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/DGA0H2459963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f82589bc149eb701221df23ec9e53ecfe19743a052c355bdd25eebe052aad07. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/USANG2449582.