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 0x57ce0c2db8cea460e34b50a943f798ad26959d384c5fe56f3611765d7afb7522. 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/513f589e-d4c2-412b-9034-26baeb100d97.json and https://artists.proofprofile.net/proofs/artist/513f589e-d4c2-412b-9034-26baeb100d97.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 0xce9953df131e0e98867ad2370da4c30087277e4edfe97786c5d35cefdbd6282f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLD682202733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a45e216f10a9e206e9dcfbeb9e8406924bce04b6b2c4cc7d62c4f4f608697a. 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/NLD682200519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc144a6e5dc276d365b9518a451933845209fd5119bf0934c5beb75bb67f85e84. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLD682103815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30dcfa93c31a556311cbafef41b0506668f7d402585a6ab32d3a561643ff39e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLZ8V1800704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe133ec0bd492b9cd97d8f25028ec6474b0a502fb2cb1ce3e04cdde512adee330. 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/NLD682200750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1884e0dff10027574e2d4631dcae46225204cdf5e75763f6e32a76976118d04f. 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/ATEK02177131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce58bb2c0344b2a15d02fb535e6fc8d765dffc92326c3c2a72b2ef7fbf1e138. 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/NL5UG2200057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c096c262ddaf78e7513b61bf74278601ced8166e4feae6df338cc718be1878d. 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/NLD682104367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67b6c6affbb23559a519eee9fa58bb55a8ab7825207606020c4dc89dfb1af31. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/NLQ8D2000437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde05e4e1b55b1767f2f315e5d70d26938b19bea73e3f77bc751c6f5a9ec3ae05. 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/QZKDK2148123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd50a8bcd098875f9208d1f6ae50a7ab1e85cef6f3f96923dba331c73900d42. 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/NLQ8D2300435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450a302f752e497fdba3f1d169f7ba0d1402f9d4463f9ec36da3501f43f1effd. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLQ8D2300434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b9ddf8692c0ff99ef3a5b8e42203526792afc8c26a2310e166d7e8e4854cd8. 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/NL5UG2200093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3e63106822f2450fbb393636ab33ff19c78034b1756f4aa5a59873c7483e52. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/DEUD42220167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3211f4cdaba5a0aa5fd0fe5f604599e20dcc10a0d115cebe3e9bff55de6f4e. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NL5UG2200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff80106090af6f9a6409a8dec12f25a87b4735c7850a34774d789550305f014. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBKQU2150859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435366f7f8e6948c57dd460abf68e6c93bd0773aaea9a288801e2572edd614ba. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ATEK02177087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9283d5295e8df9b710607907e44c13f117d370c496977b9e034940569e9edb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ATEK02077122.