Plan Three is a band from Stockholm, Sweden, formed in 2000. The band consists of Viktor Markowicz (vocals), Mathias Garneij (guitar), Tommie Hammar (guitar), Peter Kjellin (bass), David Clewett (keyb
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 0x0095eb9086b8a5612c252bcefbbf5a2c7b387fb242b16b6f832333574f2501a8. 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/41ee66a5-b44e-4f54-b887-3dfde796ec1f.json and https://artists.proofprofile.net/proofs/artist/41ee66a5-b44e-4f54-b887-3dfde796ec1f.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 0x05e97b971764cb9bb87284e6f7b333748e6f157ea171aa05a7029fca4a586e86. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/SEWLR0900403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa3f5d4d44f4a0c0306222574a75f8bb95824c4985793626dfb917d0a6852eb. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/SEWLR0900409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160441bd0b97410f13a3b506cdb2cb9ce77eb1d3ae09652788982c9ac9b3e9e1. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/SEWLR0900411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1750b909f35ad32c1782e94703fb1792971253e2de578251c8b1803ad69ea2d3. 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/SEWLR0900412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80f36439979e8f17ad8c3d345f7d1fa6605acbfea2ac95c76eccac9a03bac73. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/SEWLR1100603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8821c6edd90054328e5d988442fb62a996f28f8eb52e3f58143e8d8856f4a8. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/SEWLR1100605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf5d8febbcfd5b382c7642341365364bbaa9c34a7fa06794b0c9b4c81bad2d4. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/SEWLR1100601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c9e4584e09170232ce86b8df00f7fbf21844a0f6ff4f1133225e9ee8d0e193. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/SEWLR1100604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8821c6edd90054328e5d988442fb62a996f28f8eb52e3f58143e8d8856f4a8. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/SEWLR1100605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cd11be3809f3a38819d7553ef6552ac35c6833feb3f6a3a4c260109c45757e. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/SEVWR1603901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75fbc25a26dd2fd4fa99db891e42a45a9b82642c28fc6dad19e1de29108d03ff. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/SEVWR1603906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd146a960bb414a18fffd5d71c7e1da4a51cae0f9bad20164fba8110ff0d0c611. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/SEVWR1603907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3a922a8a494566d969c1ce27f970bec538ea11b553212b0764890b33d7f395. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/SEVWR1603909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6096c4ba84b4e7b68c2da6fa498cb5c2d3e6c5657af2f9877f3e6eae2a018f39. 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/SEVWR1603911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4491f196b43110568521e58b7a5684f9f07d18611a96ec98f820aecd1d38b410. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/SEVWR1704701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8359e1dc259f9a596f896e80b9ed4fed1a087373349036b7898b5c127aa1340. 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/SEVWR1904201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0129575e21e525b7b67a52d6f5d8b82d0d472008544909245ac2c2b6ff99705f. 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/SEVWR2205201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf926412a475a942848e7a2f560f604071153c09822da3bbe311ee8bd1acefac6. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SEWLR0900401.