thumb|Jaan Tätte at Leigo Lake Music Festival in 2007. Jaan Tätte (born 24 March 1964 in Viljandi) is an Estonian playwright, poet, actor, and singer. Biography From 1982 to 1984 Tätte studied biolog
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 0x8534924223e5830a946660ee783e40add744aea06563af462827370119817795. 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/2b7bff29-c17b-4555-b179-f69a9bbfff06.json and https://artists.proofprofile.net/proofs/artist/2b7bff29-c17b-4555-b179-f69a9bbfff06.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 0xe1b4d31a6d92b37ac7ca2b58c3702dd7c0804f3e668a3d426adb98a1651dd887. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/USL4Q2164589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35ff4dd51fa85743e3b34a1a5521b9ee3db5be8844ba05d007efee772e8e565. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USL4Q2164590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a806c32f9218ed311d0b46a08802ae7562134d8b29c1eb12100128b5ce0d0fe. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USL4Q2164591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033f3e907f345aa61cae6a226da32bad6d04ec5916e1520ef86bd384cf3e81a7. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USL4Q2164598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a75d40b7383263012001167b7ed56a6fcb077afd0914536d12efbc424d47b09. 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/USL4Q2164602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf110648ac15bb278d8a131a103f19698c81b64bdc8fd3742afa32afe3969318f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USCGH2407181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d580a260b046fd36c46cc1bc5ffdca4f57117d742531605d5d6a6872187c54. 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/USCGH2407183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389e203a2b6773680089ecba064f9cdaba7ee6b6b243410ee44f76c89f7f62d1. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/USCGH2407184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7966f819efc19c4cb8082114dad328cd80cf9582d0514e2d40fdf96bafea7df. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USCGH2407188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc16cbe3a94e386ac1797106264ddc8e74dcdb6591869e9137980636ce362886. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USCGH2407197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe045f639e273109d587471541c63b0b23ddb62db1c1131e5faca5a4031d283c8. Chain 2 (Bitcoin): anchored in block 957633 (2026-07-12T00:19:47Z), 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/USCGH2407210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76468b9d4b9e7d02f9a6d5fd0d9381f18edec504e83cea085278ce8e759e9b76. 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/EEJV11200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2859c1e6222a9211a74c4b443525f47b04a5024d0ef334f2296910010a215c37. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/EEJV11200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050ed3276512d507bc60a9fbebead072f2b0ba970280e712b53da399717d072f. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/EEJV11200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5137ef4ba8fd0509aaf32f2b0e0c995e38a7e2fa345627c5cc558aa891283e6. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/EEJV11200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbaa9d893c6e8986c6f95eeb9370b6a9cc5f1c9654acb84d230983d3410dc5ac. 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/EEJV11200012.