A Nice biscuit (pronounced , like the name of the French city)- - is a plain or coconut-flavoured biscuit. It is thin, rectangular in shape, with crenulated edges, lightly covered with a scattering o
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 0xd52492f99ad546aa207037578eadc362a0db28250bd839f5a17a3da372474f17. 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/68ffb42e-7899-4442-99ed-acc202ce1336.json and https://artists.proofprofile.net/proofs/artist/68ffb42e-7899-4442-99ed-acc202ce1336.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 0x30cf0f1ee222c626ddcf20430d63abc65c751eb4fbaa1b67de30f9239afe7684. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/TCADU1869517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x513525e5665badb9bf522807cf8dc7660f76f064fea8d1e22bda1b615276ec8f. 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/TCADU1869518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bbe7a6031b98616400f1c8ec2bad84fb16a3445f08f23fc69781c6411725ebc. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCADU1869519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39688ac33fbfa240d611ad8f35224711afcb6e4ca4303a8d86936486c35c43d. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/TCADU1869520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0067987cb03381d9530c82d1e5abfab0b394665dac63fea645b2fd778a2584c5. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/TCADU1869523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4043cc6328f90a121d7c1d93e9ae3966e0ef603cbb87257eeb556b77d4b24db2. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/TCAED1993743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de7402feb6317603f49fc5f7b8924849fc04023a46c670cf21e940c88206902. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/FR26V2072898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7395b17b8ab6eed97dca4335b6b38fe34e5234d3e0212996e03871d0eef441e6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR26V2072899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9c347e73c366c468e3baf0a41152ebd43147749db519463ac6a46fe78efdc6. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/FRX202164741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98dad8dfb7689b50e18ecb19d909c43e9903838a91f7609693f2c32ef2856913. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM6MZ2484531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98dad8dfb7689b50e18ecb19d909c43e9903838a91f7609693f2c32ef2856913. 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/QM6MZ2484531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222ecf395f8e2d24eb548e9254039806a3e9ab156f92761542290c9f0357d4f9. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/QM6MZ2484532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade01ed535a4739b05be27e317d43dfc729964452aef3e80ff3df99edecd5b7e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM6MZ2484533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b819f212e323842bd82d5e67b334258dc9ee7fed37f77ed908acc2cf245319. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QM6MZ2484535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73a27954a7da963bee84db04908a7d532cff6f2d8caf4671fc1febdb436adec. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QM6MZ2484537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98dad8dfb7689b50e18ecb19d909c43e9903838a91f7609693f2c32ef2856913. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM6MZ2484531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222ecf395f8e2d24eb548e9254039806a3e9ab156f92761542290c9f0357d4f9. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM6MZ2484532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade01ed535a4739b05be27e317d43dfc729964452aef3e80ff3df99edecd5b7e. 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/QM6MZ2484533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73a27954a7da963bee84db04908a7d532cff6f2d8caf4671fc1febdb436adec. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QM6MZ2484537.