(French for 'black cat') is a cabaret and revue theatre in Oslo, Norway. It was established in 1912 by Bokken Lasson. The current director is Tom Sterri. Establishment Chat Noir was established as 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 0x694e99d4ed9da072760aa00fb9c63ebf6a01760522cdcfc5531e29cca0644a51. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/563f42b4-67ab-4dd5-abeb-7733e1937141.json and https://artists.proofprofile.net/proofs/artist/563f42b4-67ab-4dd5-abeb-7733e1937141.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 0x875be0016545674b61e5096d032005dfe72e97e3d1030921e91de2dc6c39df35. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAGX2365236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2caaab22706b25d5fb4a96809829686e2192bd36481f7fb3b9a59833f47123. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/FR9W12351713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x909b52b5c443ea6f87b5e936904ba609f89f0f3e2a736268939e51b4256075b4. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/FR9W12351714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264af9e4f75c3e2dc35c1693b35ab73120e86884ba4580df29145e84989caa5b. 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/FR9W12405826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1f046fdd53ef0d25593972a4ea86c1a7f9238809f6d4c87c5f485ac223d1d4. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/FR9W12405828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae44765b60ba23c3732e1021e2789805cc9989515c4ee53b2458b365aa5c8dd. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/FR9W12405825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9adbc465b841552da2b87cd90632561df7ca955e25be9087a181eb0cd2d38d. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FR9W12405830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bace08fcd3474cbf59b77ede13286db607a7c4e788228d661d17cb2e54b2ec. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/FR9W12405829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863a493096cf2c208d4fb8468776932a7aaf9598973cdbdea30f922eaea7b6b4. 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/FR9W12405983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7042a3fed7a68db89d32106dc05879e791d66977b1f6c0c1ac12106f170cfd. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/FR9W12451116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cfb2bd2cc965bf39ddaabe2a9403253ccea265436ff8ddec93e02e8bbfbe074. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/FR9W12530790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c5504f05bfc92d909feaadc7fb7ea261692a89e868f1ca1700102503276f05. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/FR9W12530791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a456a7b00f67c6bc2fece9a6c1afe4c64719ee2014a4feb0a7c5af47af766b5. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/FR9W12530792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92dad5e1f95481e8323570f30b52aecd9245eee9dcab19b79008262fed8e5d5a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/FR9W12530793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f6a6b63de2a2d6c901db52071658f75deb287810923651d0d495812ee80cbe. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/FR9W12530794.