A screacher is a sail that combines the features of a spinnaker and a reacher. Its similarity with a spinnaker is that it is not attached to a stay along its luff, and typically has a slightly larger
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 0x6bcb94197381fd0389851506eb627eb96c259babf658b7e49b2b1c5fadd326bb. 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/70a7fa05-9993-46d6-a2b9-9784fe250656.json and https://artists.proofprofile.net/proofs/artist/70a7fa05-9993-46d6-a2b9-9784fe250656.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 0xb8762fd930a3f623ef4adedbb1e5dc885e129a4ff4dd6fbc77c223a3c5f68859. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBKQU2476251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4860e8293bdd9a919e61ad38da4d09e7309fc7fa9df407bdfa104b82879db7e. 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/GBKQU2456184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296e9e2f7b288415dd33c8fd466c35d74f173242955e5b7f48aac96f02c4b7f2. 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/GBKQU2430371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc47a6994cfa60fc175eac227c49dadbeb013c09b7680dffe5aa2bd4d01af1a. 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/GBKQU2422254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52ff5a37e2023254c10cffdf240f2a2d0c18c13a3a8496d524120fa4b3c2b63. 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/GBKQU2418547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718789d3f7d2520985958b4ad256baede7f951dd05e5a347a0777f7774a2a439. 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/GBKQU2416232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ebc6e0c27ba38b81fcfbdc3ea53d1b7c66c4d4ea0b8ebbb81ffb5c084d1e60. 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/GBKQU2416233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8e80c8b7fc5c2d8d0566fe16dd7d521275b9e7205e301428034ec202f75fdf. 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/GBKQU2405627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5acb3c3b9bdd84027333daa1728afbd581c1b47ba436e88259073ae0ab8fa3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBLV62321673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2d53d856fffae1298c05ac58001b94d402477be547300e50791df04867ccb7. 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/GBKQU2393326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeefc4e8dabee287437f75b4d429af0639b0a32ccf9480b73356a6ee2eaa5c942. 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/GBKQU2393327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc70ecf6368638d33cc4120fdb6a30b77d4395bdfa857330f7b56ca7a1495bf. 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/GBKQU2393328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7c814d48bf63d9b65c81ed8467214eefa18c0d8d53bc15174c96deeb82dd79. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBKQU2372058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3e0f041d17e05b22eace006f0e8d0b6a2eb39009ea6f678d2960bc11aee57c. 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/GBKQU2337709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c97402fa6d88252a3e5c09eb164d09cec8642898acb697a03a571da7d15a363. 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/TCAGY2374857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2105650ea3386dc83bd4f124255e946de4c69c57aa5b9f95410b1ad8c7117a. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBKQU2318548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5346a4b8d80c7ac1ecdcb117ff78a54b578b38924501039ffb7e21e2840b5db3. 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/GBKQU2318549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c9bc0bed222dd26384ecdacb3aadb96230c1c9845a5973dd7232ea0eeda5ea. 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/GBKQU2318550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec58718d9b00da67574583846768a1f398853e79ce302fc179638e509cee096. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBKQU2251954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f5a354edabe51e450244c69893e5d8422001af4a9313c52c9911e8c2922770. 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/GBKQU2251955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7509869b1615743e2069900caa83128044322f95734920eae1b827ce873171. 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/GBKQU2220761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5d5e861a1aa8458c98a9c71e6585701f844bea271dc9568fbbdc050827d236. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBKQU2220760.
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