thumb|Johnathan Blake, Oslo Jazz Festival 2018 Johnathan Blake (born July 1, 1976, in Philadelphia) is an American jazz drummer. Biography Johnathan Blake is the son of jazz violinist John Blake Jr.
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 0x118746cfe2a6be716b51f4ae1d64e453237f436e8422d8c55dfd54bc8bb7630c. 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/34fc6d34-37f5-44ea-808d-70eb704e3260.json and https://artists.proofprofile.net/proofs/artist/34fc6d34-37f5-44ea-808d-70eb704e3260.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 0x685762ec8c1298f95486154ea8b487f6e26687a90aa58c9dd3f249380a7e4b44. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USUM72114701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dadd3857676602a5289eb4ebf3e8bc8e39105d9cb6870fd6342d156b6aff6f. 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/USUM72114696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab109d9105cf1ba47b367c0b079ab8f279406665a7256ce1ccfa14ef738f7a9. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USUM72114698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a7ae45d39cb9fb092c57cfb63dd9fe553a93e1418f8b45082524b63cb9c7e9. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/USUM72306976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58ee99b0beae785e728180862b922462f9fbaa9f328129dee6f5d1c19e5c789. 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/USLD91757069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e814e82cb8024c6d506979c41f0d066afc749448d2dfa2de0b8234dc38fe7de. 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/DEB332173904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e2aa5ed9ed20afa6fa3c3e2f82c908835d64efdad91ded32ff02d77765a358. 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/US5821900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbd1a636943bc1607b9b1dfc55639f514df8d732d488f17fe7467d29156002b. 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/US5821900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6157cbc7093d9d2560e817dd13630aef7073281f20cd5dface2875f7131a7b. 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/US5821900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927228ae583482fcb6964eafa89774c09d1df63a1b39d07543a9bef9a731551c. 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/US5821900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502da36816bdaca8acf4e19b1a74deff3234dbb9acce2041a9845fb51f8db480. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/US5821900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c9b2353aac7ce5472903841d421970309ac4cc4819a2c6dd31d00c4c3cb395. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US5821900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582b60a0b96beb51dc9e51b28e7bfb7a8c26bc5d6ebce6859be1aacd4e713554. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/US5821900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02bd9b42f162d1ed57e6818ee8f2d640f7e434fe67b03260fa63bf065cb70edf. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/US5821900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8a1e593e32228fea29d9cf5367cf0a464a7a52cf8898f4aa822d7def4f3471. 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/US5821900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef5712f5cc353c227d31b27d434b1f2b5fadeaca2a058e89d0c61ac4dffaab6. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/US5821900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025ac1eee2560bc06bc4979c0b310bd02c894bcd4a370bff568ce2cfbfb81bf4. 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/FRE9V2300360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5898480aa461016d50a0393bce9bb1ec4660f19b3429b79419ab08bdb72e1a9b. 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/FRE9V2300370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f6b0b0dd6f25781fc30ad0d163b97730dfe83237bd56e82fd158fe7debbb51. 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/FRE9V2300380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370bee111f502d18c0ff8504e479d38917a763000b79a406060ced22371a560d. 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/FRE9V2300390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631d95572504ad2283534a3de31ad7e7e584e0a9b2a55376d87464743afba375. 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/FRE9V2300400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0313a2f6100a62898c06eaeae75ae9bdfc7fd72d7284bfcc20db5d1a3454be6e. 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/FRE9V2300410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb24e4f2b9be2101de43f5c6ed72108f2e039de6119515a07af8eeb1d2f19741. 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/FRE9V2300420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb014fb50c7c7638e260552534180eeb19e1f9366c381666d2294e8745c51b592. 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/FRE9V2300430.