thumb|400px|right|Some polygons of different kinds: open (excluding its boundary), boundary only (excluding interior), closed (including both boundary and interior), and self-intersecting. In geometry
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 0x2eaeb116d3d9f098d4e1cd00721c4b12e0ed2bb350af8bd2cd387febf83262c1. 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/44d4d335-8146-4169-acf4-2e45fc1df323.json and https://artists.proofprofile.net/proofs/artist/44d4d335-8146-4169-acf4-2e45fc1df323.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 0x2bb0e3d16e9a8e12614cc44061c15dc02108819c0faf3dbd8e373f549d9ca178. 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/NLCK41060353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59508614d9524ed92bf8b83574c820472c14b3bd3b9e2a2f3a5c2965d918463. 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/NLCK41060356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3cde46f45457d867a00d3bc4c5cfefb0e32a695918bc76b89dcf62a3963eb03. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/GBTMZ1900982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5d536ddbab6694f5aec0044e9db55712cf21101f8077cf61f1e8b3c501fe32. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLCK41093943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c2ebc2f8b03edb9212303d8b3408cf404944dca8ed31c53db2ca8207364719. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLCK41094766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194a7e9a74d685090b1f179b3017b5a39906d0a0ec6641b5ff271d33f4aecec8. 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/NLCK41094767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9493b812ed560ce2cc22f4a547997efff0576661f3d387dc721cac2bdc044780. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/NLCK41094484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b38544c44aec68fb06e61f2e33f82c85405efa905e0caa933a2c0823d978fb. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GBPWR2200068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9aa75c91afdada8c9f26123e47134742fecdb2731aeec49878ce5c8d939a71. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLCK42235670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3cde46f45457d867a00d3bc4c5cfefb0e32a695918bc76b89dcf62a3963eb03. 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/GBTMZ1900982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430548b3949d3e469f8ee40889859cf2a09aea826f30d608e421a2bf635b5bb4. 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/NLCK41087668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7681d4473271b2cfdbd3fa0f82eaba868c87fd8b8e3ebf09fdd9fae6a9523255. 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/NLCK41046421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc293e19879ad318e00deea61345f0c37e6e5f8535de82e02c1d92c7312447de3. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLCK41045643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2a9e79334ab42fe1c37949ec38f035049e2a3dc25cbf9b1dd4036d0b35e862. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLCK41045642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9aa75c91afdada8c9f26123e47134742fecdb2731aeec49878ce5c8d939a71. 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/NLCK42235670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c2ebc2f8b03edb9212303d8b3408cf404944dca8ed31c53db2ca8207364719. 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/NLCK41094766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc999c61da493639750a8294a88573ef7161b60f175bd25b5e47ee97c85f2753. 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/NLCK41054212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207f971076fea5c4caf7ab77cdef7a0d48f5d3a6f43ccac0e085566424c892b2. 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/NLCK42236143.
Drum & Bass Annual 2018 (Viper Presents)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13cf83b4600e2ae2541dffc037d4441cc2a31868c9846dcda0f78072cd2074e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GBTMZ1800726.