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 0x20d13141e6f3fdc35538d4289a4b6fe8340e9a483ee538c90095869cacea3302. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/781fa9bb-0129-4ae1-bf24-a54d4c6b6c98.json and https://artists.proofprofile.net/proofs/artist/781fa9bb-0129-4ae1-bf24-a54d4c6b6c98.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 0xbcba12e3f33cdf123fa377f66a5326991be69b6a5d9a74a86a675cb5e160ed97. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEF230200123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5528f69e0bb0cd030bd6b21bed8bd5ba53f5dac0691343f53d7f24082db12ea. 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/DEF230200108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4747cf6edbb95e7b5d31d7b4d9b68efc3b0685ac797653f1878c29eeaf32b6fc. 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/DEF230200119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8cd9444ffe3d470968359174f1f98d9dc2c1e5524bf60a29bf2c1e692ec2ce4. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DEF230200122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba410fbf4f6c215e91ddca080d848497ce131f7865c2b5f085c0a3cab6979392. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEF230200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e2fa5775b5b02306d1131239eecf423c21dd9b4c20079becee274a750d2166. 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/DEF230200124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0303e4a72cf407819d859587847e9680d8b70fb7b6c4482bb050e78bd3bde26c. 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/DEF230200111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67bbb2fdfba00fcb20c3f6364868415fcfd4393447aacf346cfb3dbad1ba6caf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEF230200110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf2e0a6c8d090c06ecbf206f042bf31116abc5414c24073181ea172e1f35cb7. 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/DEF230200121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af82e33ad502f968afa98a2e6d03aa817aaa6da97c9a10e5c9d09aebb65d0be. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DEF230200107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2437f0fb2635bf5a108b698549bc6595dea7fa96cc6656090b241a452dd99d10. 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/DEF230200114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7dc566d9403da9fc8b6287ffc70dd8d4bb5cf1391b725cb15063b496430031. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEF230200116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd749e4f5696396daa60a4b43c6c475faa34fc121d1466dee42a4de54413a0699. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QM3DF2110158.