Wilhelm Heinrich Otto Dix (; 2 December 1891 – 25 July 1969) was a German painter and printmaker, noted for his ruthless and harshly realistic depictions of German society during the Weimar Republic a
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 0x4f5c6a788f29492d0fb37c9ec140c6950acfe2a86fa40ea1e880eb682d37a367. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63a3684c-89cc-4d0a-b4a4-bb935d20dab2.json and https://artists.proofprofile.net/proofs/artist/63a3684c-89cc-4d0a-b4a4-bb935d20dab2.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 0xc29dbda00fce57a1235e1119009f2f3e6e2546225165f4ba90c2297de8dcc1ef. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/USE831524013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4608554922aa2bada91653fde77595e04893aa3e7d98022b7bde80e04a724529. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USE831524406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f064573b126379149ef71ba75bf2d31d3ecdd7ea90a8e80963792fd773eb473. 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/USE831524924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8f0a0a2b6158f40828a1e34a0179dc439770ddf8243d4dd98bb086fb871b7a. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/USE831524930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127146c187e2b40a0fcb4084ad38bcb2a39cf32a697ed1f3e676ee9fdbd9233f. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/USE831524931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8359194e4f9438b108fce463c678d13c84d89a67fb33f727f8a703706639185. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/RUAGV2300839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bb75f65a10f23c17fb5d4a8708db5b8e04bfeb95e80ad3b0055f1e2126fb51. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/RUAGV2300842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12509dbf02f3eb2bf70e6cc1bbc2eaa6e2729a7ac5550175a3631ec7ec24dfb. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/RUA1D2551791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9dd45d942eeb3dfbfba804eb88756fed7b5817d0d6a532f0f11ce879d06777. 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/RUA1D2551792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbf41971d096262922426886aebf9aa87335c3f6f3de3b85b14089782c63b66. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/FRX872574840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fa67cbddd05f210352b8f487c18c8e5e22b35378f63f7b75b919caff2a3a52. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DEZ901600779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218b549789c806e397e31d46c9d95dff004b0ebf1cc4195c5d4c28aa86527883. 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/DES372100666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb72de5c6f66665ef5972290a785847d6caf4a3d4e809b1e59b22ec62103857. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/RUA1D2441243.