thumb|Merzhin in the Festival de Cornouaille 2012 Merzhin ("Merlin" in Breton language) is a rock band from Landerneau, in Brittany, formed in 1996 by six friends of high school. Their music is charac
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 0xf60b9f81e13ee5de7114678b178257e522537c3d96d845bab16998662412c327. 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/dd3ad2fe-e540-4ec0-83a1-1be5b425432f.json and https://artists.proofprofile.net/proofs/artist/dd3ad2fe-e540-4ec0-83a1-1be5b425432f.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 0xb63252fd032dcc2edd56b3f19edfe42ce1e622c494fc9ec18a6f42e9c8d7f2ff. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR51T0000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69c4ce7de3ad3bef4e14424b2202e4086c0bbe7013e53d0cee1252996b2275f. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/FR51T0000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6bacd6599488d7c999f0b156f9ede187ecb539a050e578bd6d99b05d3d880d. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/FR51T0000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca61355a7ded7bdc4fd0dbf4b438df788652b771a836c5795a8222ae4e0a7d8. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/FR51T0000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a0d0350c216bfdcd8231d0159861db1f0cac3934979922c3a0a80e1752e869. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:15:22Z), 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/FR51T0000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef444b00f24dc5c3601d2291376193b227550adc106add22ee4e74c371d6606. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/FR51T0200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb414321f9cb3857d609e20b098c816a1aab64ed0d7df852e6014e0766e8038b8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR51T0200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cff3ae835a20f3a8aef9e4083cb87e5f663baacaf91176ee86bb61cbb43cfbb. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/FR51T0600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02d49af10c06f5aed1c508f1f7741b6411fff3e2fcc1cb42ba17031b7f5ced3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR51T0600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62888ea4b89e5e60cb68c71b51cd45338a5a878de41e7d0c08d9a1f56a162ed. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/FR51T0600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37eab97a6965f4542655cc02611e0c1328eabb5bc21a24d8ed687870b1b9a15. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FR9W10905894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1200e2ba90440bf0da2ad666ac9cedab8b0e45747b30079bfa4f4513414f371. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/FR9W10905898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33a8b09ccadf26ee3b6e7fe670c17b0d3b3502a1d4497fe386a93c4838fb7a5. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/FR9W11105893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404eb0b2c33372ae314ce79b92eb5c653b9d4935d9735ef36b793ae5adeb5381. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR9W11519357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8126b7e8e0025c08b92c943ca3b8144d917337a86aae26f529f960a9d99e02. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:35:03Z), 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/FR51T9900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608b887d9f90ac4064a6586ff15d5bb0f542a656ff2f4df16e15258f2230650d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FR7Z82200005.