Saku may refer to: Places Saku, Nagano, a city in Japan Saku, Nagano (Minamisaku), a town in Japan Saku Parish, a rural municipality in Harju County, Estonia Saku, Estonia, a small borough in Saku Pa
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 0x1cc9f03486c102db47629cf8964928301e866ebc656c82d59c6fdd3fdc9a3e4e. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4b8b882-6d75-4821-a95a-e16bfecfdf0f.json and https://artists.proofprofile.net/proofs/artist/f4b8b882-6d75-4821-a95a-e16bfecfdf0f.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 0x756ec0d7bd670686bedff055f57835b1c49f7f61d150eeb2a4bc5e1ac7a965d1. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/PLC062257619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9dd8995db5ea52ed720792d9cfca8e11975761bdd3f27420d4770d9b7eb124. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/PLC062257621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5700532ec8ab1093fee57af34eeccf843882ce2e1af5472cd936f2ecf287a0c2. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/PLC062371261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1b1ee3db090865788718ed786eeab037a6bf3b58e88972be0a3ef1f999c526. 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/PLC062386834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05efbcf4384adc34dcb9bf285f138455ed59d58fd35c19048ccb33a86f75fc3b. 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/PLC062381280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26bd64f35972fb32d2bb4b0b89aae036d5f37e0af49891a53608ab9de65622b8. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/PLC062386837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29da461af4d6be80b96c8f3fe35417963b11580b99366f1aff024fe36bbdd7ec. 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/PLC062386843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f38a83f28c5d332f37dd1b439cf04a70bba98d53951cb5dcfcf1046f56ef5e. 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/PLC062386363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc69f136193a0f8b4e13199bbd534529fee1311f3817e638511a2c64f7eb403. 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/PLC062386844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30ab54e5918f55ad5642b02fee3717f3672a902c6e089b1fb0c84dcc0ab6da1. 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/PLC062381111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbcc8d423dd76ec374217caf525057f4e1a9ffcb10d63617ec06dd96b2b1708. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/PLC062384071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d9b04ccbb774c4872aef42b51e79c397b51fcddd2a2fe0e0316ec8b04ea158. 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/PLC062407177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2a52d84a5d205aafe4f3ed802b33602865d61ecd9d2ddadd9a04841012ddc3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/PLC062412994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca310a2485302c963a9ac46dc1932d0551295fe0f25b79449bd132c72ef9034. 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/QZZ8B2432498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058afa5a6d32d1c401b7bf873a1a49b867296e0befaf0d17ee916d6c3330be35. 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/GX8PC2561716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d90b35f70e6397b7d91bf2eabdad212c2f22eb342722e5ab03140ce78ccb039. 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/GX8PC2535554.