Doug Martsch (born September 16, 1969) is an American singer and musician, best known as the lead vocalist and guitarist of the indie rock band Built to Spill. Career Martsch's first band was Farm Da
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 0xe72722b987e7560def577f133473475f26bd8ae51bda377605d4e31e7758886c. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/41012ad9-cba1-4d0b-8d92-d85593ca5db2.json and https://artists.proofprofile.net/proofs/artist/41012ad9-cba1-4d0b-8d92-d85593ca5db2.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 0x8e45bb02fd654d3e0ba41ffb0a27db4e7bbc52ce29b6eee68e31352729e996b1. 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/USWB10201936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdedc967acc78146013d814a36c3baa8080338cf63f16d1dafb4cfc3aa135f61. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USWB10201937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb980f58b78fe1e01bfd23827f36b2f89feeb2a1e441e8476aec1fe06a6a87265. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USWB10201938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c6986e432ff3ea906ad233d22ad1d406d61948658708d6b769beb58641e1b7. 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/USWB10201939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7905b60d97c6357a19294f0e5c189f0763884fa837c27717ad0a95e8019935. 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/USWB10201941.
Woke Up This Morning (With My Mind on Jesus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b6bda8315229fae66771cb2fd47368e96ba9a2966fe06dce6f901f1b2fd538. 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/USWB10201942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba59d26926126bc825cf84a58612038201a9f4ce3e9b6f3227addd7f9c773790. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/USWB10201943.
Please, Please, Please: A Tribute to The Smiths
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51978760e680cbb343f05b4ff0903f043066b4a9fde48486dee96639c8b3631e. 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/USF461100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65e26c2994e8b290478065e7a2e20cda9ec4272013eefb267d9841233455117. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USWB10201940.