Black Circle (or motive 1915) is a 1924 oil-on-canvas painting by the Russian avant-garde artist Kazimir Malevich, founder of the Suprematism movement. From the mid-1910s, Malevich abandoned any trace
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 0x3aea94562b84cfe65f5a488d3eb48145607814e728e9cce950f608e65ea7bad3. 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/4349f56b-d160-4a8b-80de-75e6f7dc29c1.json and https://artists.proofprofile.net/proofs/artist/4349f56b-d160-4a8b-80de-75e6f7dc29c1.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 0xd17d315ed55a9530e491897352fc58ffe151693fe62f1c75d2f3b3fbb4e78c9c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBSCL1989013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428c6747393a79e6efa7dcc9bc11cb80b607346a3ff101bd851f7940339dc56c. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/GBJAJ1902104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae7fc523c86f1ab644b59b4bb601056f79dafd2e1197959d7aa3c38303ca232. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/GBJAJ1902105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe873b5a6591421d82a30989f7b15908a151a66065d3c791815010a7797a6d830. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBSCL1989046.
Mute Navigator - Black Circle Remix (Mixed)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc375a65f3abfc2293e3decbe855abb90f726d1e59fdabd0e004408a186baead. 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/DEX042200034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c572e6249324114d42f60543145623e5305bc4fbf3ec972e3128423c2cc80a. 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/NLF712207370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f63938947af0805e231761631331825e60707d5e023de37a563529e91678624. 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/NLF712208173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe47e2c8ae522c42bb743da371413a1811d56d029c3e2b65dcb5a066e6a742cd. 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/GBKQU2241154.
Reality Check - Black Circle Extended Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004c210b6373666c7fa12932aca43ce34f57b88aba56e52d14e9c02f79ee05bf. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBKQU2241157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77df33e308f0fc8b007431ed7830ba309ca56a061b21c73759e3d751510fbb7f. 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/GBEWA1903511.
Into The Night - Black Circle Extended Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa7f01caa8bd9ebf3cd04fd157fad63f0f9a702be470b626458e7c32a3bfc5f. 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/GBEWA1903514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff30ae8e329beea22bb2113359a6d28d132508a60e98d332defeeb90a6273b5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBJAJ2001041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ee1137991199ab2d21d2f9233078375341453cc31b8957f96fbc3a1bbbd254. 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/GBJAJ2000424.
John Digweed - Live in London Recorded at Fabric
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d327fdccc2934d4cfbf1f78ddd0555dbf22225def911ffd57f951354eeacfb6. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBKQU2362662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd120be5387d4ef4d8fcb24d5f8ecfa0c0e8e2dad4988f6ec6a61b5e6bde537c4. 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/DEPX42000358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c2d14308ff69637995ee3a7218fc32e03f59addca23b591e99ce0a4aea7dfa. 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/GBSCL2289001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25b1e4730effdc08cb9c3fe5fa2a66c3ab3ca5595729f226b3811080a0ffa58. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLF712303422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99369221543c5f00d9f59906a2653ec39f4ad2b24e894f483e21c17707b33a6. 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/NLF712303423.