thumb|Matmatah in 2017 Matmatah is a French rock band, established in 1995 in Brest, Brittany, originally composed of Tristan Nihouarn, Éric Digaire, Jean-François Paillard and Cédric Floc'h. History
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de76a378741abd714e2ce2419ea0aad22c54b8553813f2421a088c8a75d271e. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ae3510e-56da-485f-a9c2-edb56da4e5cc.json and https://artists.proofprofile.net/proofs/artist/9ae3510e-56da-485f-a9c2-edb56da4e5cc.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b17ac94a1f17a22803230cb791cd4272ea2397c3998124124cb8ee95a205fc4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR62N9800030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f036592d4553e3831b013919cdb18610fff7c7249fed4fe733a79849cfc03f. 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/FR62N0100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd602967d94a649bb498581683d895fdbaacee132f47c9f63b7c634815b647836. 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/FR62N1500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b17ac94a1f17a22803230cb791cd4272ea2397c3998124124cb8ee95a205fc4. 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/FR62N9800030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045baa6e7c5a98ac796087961fc385f2793cb40c09d9a993c745a1179acd44b5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR62N9800080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf50c3f84c2f448634be95c1b61e7efa7c48c8f4a8b366c79770d1adae86088f. 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/FR62N9800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0422f31221462748878929d9cdb269a3abf661bd3f46016eb1a13d21940550f8. 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/FR62N9800070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8cafa23f77d9d3d208990ad8bf81f7a1b8a5da2e9d3229788fede9f63a3a525. 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/FR62N0000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec776070453b9181e01a88c705976727ba540778e1583ec93a91849d6191a61d. 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/FR62N0000100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c4ecfe52c7a16e4818d63ea0214ca233c170b56c7a05374ccf98b2da365a81. 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/FR62N0000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf98f0e6e4007166d5c3adc3ecf438b41e3692eddfba5f915c2aa372d65deda4. 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/FR62N0400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f12bf02b894b02809db1d86cfe5d2e0d1594d64216ea049c8a8698d6184d79f. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/FR62N0400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54258dea3154e47fd6fd1e4658d96e2d705cdf436d5bea70099df6718091cfef. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/FR62N0600170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac68253ca59deb897d853df82710c31acdbc786a4e45446d19489cf6c52e3e0. 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/FR62N0600090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe684b77d791cb55a6c0bb67326dede5526e845509a161627dc15ebe9b20fb019. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR62N0600140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b274762b6b9ee4fc7bacd2ca2dbf27ee27d1114e35c20671ce65661b69c5748. 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/FR62N0600160.