W, or w, is the twenty-third letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is double-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 0x8c09c146b8477535d8d58ef016ef36a27e801cde42b85f856cb9336c22b3ff5f. 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/cd335d65-19b7-48e1-b86b-ea4bffc22461.json and https://artists.proofprofile.net/proofs/artist/cd335d65-19b7-48e1-b86b-ea4bffc22461.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 0x76bcf3a8ce013b95112fb5e1b795f321ce735154eab2c85559fca58dedf66987. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/JPA600401760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e3bb1b74cdf9c3f16c99ffed4f5ec69123766be6919d67258ed9529466e4ee. 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/JPA600401770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee044ac7087aa61558b1c36ca646ee7c6ca3f18307cfbb4a6ef3ec02ee1c245f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/JPA600401800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641cbf0a3e7a8cbc118886ccd4b7ef3824bcdacf8598199ac529c2ceb5cef212. 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/JPA600401810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2216b3b1a7fded0be6337eae7ee3c5268c9eb6b484f683e975a2693f09b06254. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/JPA600401830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f69f583bec510c8d07acdbf4673fc51e277c5f8b8d96ec979882af0ab68238. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/JPA600402160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4329576c243d87fa3e05d57bef451f32ad80c3caac373ab0821295261359bbf. 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/JPA600402820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874d7d9399d1229935ac4aa49462951e1c6fb5fc5fab0e871990b2341937666f. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/JPA600402810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb6e64f3c91eba5998aecefda4d23efc0957ae3a1254c1bcb7b7e7a24924b76. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/JPA600500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922816999624274780efed6c917dd46f275dc1252ce478fcef496ff3d639e1d9. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/JPA600500330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f69f583bec510c8d07acdbf4673fc51e277c5f8b8d96ec979882af0ab68238. 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/JPA600402160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69bad0c916bdde1075a46801b20ee6e9d9baf1aaa3dcf71b5d621bc1eef321d. 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/JPA600500390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f69f583bec510c8d07acdbf4673fc51e277c5f8b8d96ec979882af0ab68238. 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/JPA600402160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5f2fe38d13f797122eeb594bb83feb9aa91634ceb5eb6ec4b1c0816da02dca. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/JPA600500750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb976bf6ecd90e68bc388a286b68a0c8bb96100fcfae261a0b2b4781059b3f9a. 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/JPA600501420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c1a466ebe4faceab8ac2f478a9e569f31a24c8a5dc880bcab6fe277f99b9f3. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/JPA601900079.