Markus Barth (6 October 1915 – 1 July 1994) was a Swiss scholar of theology. He lived in Bern, Basel, Berlin, and Edinburgh and was the son of the seminal Protestant theologian Karl Barth. From 1940 t
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 0x8152a45e236ce088b41f96b0028b69e105089541130b55d7606e776860899898. 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/a1aba799-3a59-46ad-8889-1610317a961e.json and https://artists.proofprofile.net/proofs/artist/a1aba799-3a59-46ad-8889-1610317a961e.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 0x52bfc969f2a1456f88c0bf7cc841af49bbc733516544830447f17f71e4359d41. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/DE1A42168815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0ff770eb2e9cf981f6add1a60f141ea91c8a1199cef49f61b178aa5d5ea21e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DE1A42168821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8b74a75ce14fba4e99c583f941734fe158e568e602b6c50cb4f65c4b3960bb. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/DE1A42168825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabed5367e72e57d13795f40df9a6a564c069ab7f9a18f5652949f693eccf4fe2. 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/DE1A42168829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd5e4bca8a42ddcf5d74099d1b83c0882a782c43c5cca6dd63183cbe430e0bc. 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/DE1A42168830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf8b98df80c7acfe49e166ac5f5d3de7e07079e406c8ca20e8bed7304ad1719. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DE1A42168831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82185507d05fd8e5ea32bcc3d663fb8c77a41e0bbcc700d75f4313efba243a4. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/DE1A42168833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3023f5086720c0e737ac8f58ca1aa037bd3fe5cec31c1c3a3d789f4733d141a6. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/DE1A42168836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb554ad806d810494ee10b78f27f59772bf515db0d1d19f57dcc1cefa7204368f. 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/DE1EJ2500377.