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 0x2dbeda4a40c8289f615c47a607d378a917b5ff881b863c6e5a39af9c8b52dd06. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/932f6282-c7e9-4673-98bd-5e7ecd050282.json and https://artists.proofprofile.net/proofs/artist/932f6282-c7e9-4673-98bd-5e7ecd050282.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 0x600a7576fc70834456224fd4f4cd400f27b1ac8d9f98b87597e2dc764666100d. 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/FI9TU1000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e738e7c26bbe06cbd21d0f00c723e0b1e45d31f9f2eff58962277452d2a8d11. 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/FI9TU1000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660af70c3ef897c89b82b3909be6eb553205a12d62115a64216a46bbf3c65d80. 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/FI9TU1000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34bcdd5a7bb5a76b96dfbe1b29b3dbfc584be52988e2a475c98a49f86a174041. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FI9TU1000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405eb018aec67b66072fae0e4a516d3c12b9f48388758565261318055815d243. 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/FI9TU1000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b88872613f358d0d79c0faa3682182a39b4ad3be1ac636739b6bab4daa10c3. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/FI9TU1000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47bdddcfb2d1af7746bbd6f981722421809cb265945fb704ff7ac15a6dc3a89. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/FI9TU1000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04cca45797daad4abbb62c98b5c70538458cc8af7d08507736477bc3028e336. 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/FI9TU1000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3841740b0aa25c3ca889d628a19e1f854c162daac95d7f12e710fa28ed641b. 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/FITMO2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0961ca5dea3ba421b6e7374d5c6661fc073531f318f442243c90cda4aeb06b37. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FITMO2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9473fb74119251cefbd870c670718e6d5a8f1b23a21e51cd390cb5747fd006. 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/FITMO2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71fad7e278fe538d816ef783d413aefbcad2eaf634dd3c5fa0cb95178c84376e. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FITMO2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c232df7cc9744b0a45a7b8a6754ccae40e31a1160a1234e555181bed0f5b2f1. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FIJFR2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf0d32bed892298210e0358e6b32c1a5c5521f1f7d787899e021c8d0dd8f54f. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/FIJFR1800001.