thumb|alt=Photograph of a country track or fieldway |A country track, or fieldway, in Slovenia thumb|alt=Photograph of a mountain bike trail |Mountain bike trail in the Forest of Dean, England thumb|u
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 0xfa1b60a6857cd4703695cb33457d608b8918aa5e94f5aba13f8714b2ff4f12b5. 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/18835f40-8526-4fba-8986-1511cd6b4e9a.json and https://artists.proofprofile.net/proofs/artist/18835f40-8526-4fba-8986-1511cd6b4e9a.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 0x0ff342ee17641f71f5aedd79620e020cdf8d808345b8bb7ea5e9479e25942ac9. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FRIDO2111471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7b0cbf9ff372a78d5f3e12029c52e8e2a3b2b62a301676be07e8a6c9b7bfae. 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/UKEWB1600290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f6385c18f24683fb733249529695b00540c0b37e104f52b91d6f61b2cc0d49. 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/UKEWB1600337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99b82b0b735b92f8fb698afe0bd51dcc1a2ec4bb98cf441f702a7c33049f5d4. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/UKEWB1600335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fec781c24cf9898eda3be9a28e98614ac8d597c0cad3a36f3bd2a9a7d90475b. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/UKEWB1600336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2207f68c1b34489f9751ec949ba867d8da8b83da0e91a30790f808bc3931b01. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/UKEWB1600355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe991922e3ab5e7f02da4e709a922c965fe3de5be5300873ad84b586b1e36e1. 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/GBLV62308060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca54f2d93acd44d23b978301fdadd4293c885db504c7169dc704ac5bff1fc1ca. 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/UKEWB1600400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0182fc60ef7a6d62f4b03e1ef2f0e479d6a7b83a2b4879b8391b2682679e01fe. 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/UKEWB1600399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca54f2d93acd44d23b978301fdadd4293c885db504c7169dc704ac5bff1fc1ca. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/UKEWB1600400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49657f54645673104ca84c81e4f6d068bd20cdbc9eac9dd65c4aae2c1b2473b. 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/UKEWB1600398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34eb0ea90aaec0a2ab66ff681aa3dbc817811d57256657eaf868155a2b1425e8. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/UKEWB1600438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d702ac920bb6fb8dc2a827bed7a5bca3502ba327c437d51760305f53f1d3d0. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/UKEWB1600462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e592bcb388f6aada66222662276ee1f3bbe1174d80755eb5adad97b2eb30bf. 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/CA5KR2459528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813a4550724ce29229f3c0a4e33fe3c64dc3fc84285f46fc2699ea3a6941f487. 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/CA5KR2456641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc354cb02b1f1bcf75d61678126de9fbfad93dcd54c8b6a256540977657edf29. 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/UKEWB1600227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc354cb02b1f1bcf75d61678126de9fbfad93dcd54c8b6a256540977657edf29. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/UKEWB1600227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ca9fa5dcffff2f81ec24f8dfa256a483312d67a80949c116ddf73764738043. 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/UKEWB1600365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc83fd2503a391b7a2a4db8bae426ec013cee74768e3cb4df8b1ef2243f1810. 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/UKEWB1600295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe991922e3ab5e7f02da4e709a922c965fe3de5be5300873ad84b586b1e36e1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBLV62308060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff342ee17641f71f5aedd79620e020cdf8d808345b8bb7ea5e9479e25942ac9. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FRIDO2111471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ebc037bdd169b8aa702dc5fb9bbfdc48155c887840f3254ce7b3328e16d990. 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/CA5KR2505521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f036f5b9b64d9d07a174301be96902336d21c72864110ed05c356b3f453946. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBKQU2146860.