thumb|Ankou in La Roche-Maurice, Finistère Ankou (Breton: an Ankoù) is a servant of death in Breton, Cornish (an Ankow in Cornish), and Welsh (yr Angau in Welsh) mythology. Background Ankou appears
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 0xe1c678be65df4ed5e4bf954df9d8eabd8b587eeeed25f8644b290a7a47e5582b. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c90086b7-010f-43e2-905a-894a16b630bb.json and https://artists.proofprofile.net/proofs/artist/c90086b7-010f-43e2-905a-894a16b630bb.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 0xc276ebb94435f1c798364f2dc79582b2fa2eef95e84827a5b784ee50b6250b28. 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/QZMHP2380639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222831f9184d15b6cd4a261f22c8e0bd25eeebd34bcce987eb1d7b30d8b5c6c9. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZMHK2232904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb8501d25036913f23c5f0de2d0f2fccc6fc217865321238821abffef3ab691. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBS5E1100303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d596f0079aa7d30106e533954a599007e1fbc110c84f7189af36db137549d4. 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/QZKDK2350470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a5aeac3577f36a0fad4f67cd50ab7b12a3b50585f1f3a84b9926b0a6512605. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZKDK2350493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3856f2ab0f71b4c1e69e714fc0d53ea7cf78d9807d521435d3bad188666b5bde. 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/QZMHL2402812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081ac245afeeb86d75a27d66e4e4d779c6cd7b442bb18d546905991bd01eb106. 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/QZMHN2438414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8877b003b8bd75853338d322b16b91d330ecd9a83b2b0a57c1c06ef66d998dda. 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/QZTB72224899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff816d4b4b2ea3a39f2ab70ec24f6b22a838830a4d15780f9cd998a9067c3f8. 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/GBS5E1100288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccc191f7cd2132bb648253657a7d5c5382ade24408f1d3997b7f35bbb35d51b. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/GBS5E1100272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329e9b4bfc692f3b3cace8bf9308e558b94e96d5ef4bac9bcb5f5e0f79bf7daf. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBS5E1100273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49522cce9faf247ba892c2aa4553b74076ff2396e526108658127b39e73483b8. 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/QZFYZ2072877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc11abbade9e65d7a8aa55944e137e5c4459a22f3dcdb4e8f6579c0aed9c059. 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/QZMEP2158247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc7a860266078011f5dd1f8b2a4622ed1d8b6095d2363c9c4864c927c9db5ec. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZHN81931640.