The Chairs () is a one-act play by Eugène Ionesco, described as an absurdist "tragic farce". It was first performed in Paris in 1952. thumb|For Ionesco's Sandaliha (The Chairs), Bahman Mohasses create
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57986279d8ff569170668017b66c028758e6e9039b8e5778720e218c6c062fa. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/41d64002-230d-4fcf-95c8-aa7fdb6384e6.json and https://artists.proofprofile.net/proofs/artist/41d64002-230d-4fcf-95c8-aa7fdb6384e6.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0428cf6491a361d869f765d48d888f62cfae35b1c98e88322a3215672cd860c7. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TWAG51600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c558d88fb5192ce75f593c9973b5107e598c60aba261d0f522e587a218c9320. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/TWAG51600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ddbdd3edca735e928d60adb2ca4d03640db1334d9833eb39e494ae3a27d3f3. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TWAG51600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc97d75baa7b954fee0019eee1370996bc34494e30e46439a22f493036c0dab3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TWAG51600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4838b4a0edbe2abf4fa2572872c7d672924feb5373101f02115263d7bac0d58. 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/TWAG51600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca88c9811f034e2a57ee912227283f06a51222ff38a1c9230310db921e510d67. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TWAG51600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10faf2b851d3b4e41600d0fa9601d2ff8a6d17eb7e34f7855ff47ae7a55b16d3. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TWEI31800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e4db297d018a701617aeeede27a2bfb13e380d51e67531532e04453e8b3b8c. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/TWEI31800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b37108615fef35857406f00b596fbae35d79cfb5e30b1c8efd4465ba62d65d4. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TWEI31800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76aaa21d0661dd7a54b3adadba10dd06e05699944a316f10e2121e9884465b2. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T11:01:12Z), 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/FR59R2078733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb331584da6759110dac6652e1cc9fc8dfcd1b6e9169c85a5f2817ac9cbb628a. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/FRX202068908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274d4458cd64be485b3b2193d1cc5f56a58b2c73e4dfd2929c17c0b83ae9da51. 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/FRX202170061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb49e94704e77f945a857a103c0b21f1cc7ecf12979c54f2fc19b9641015394. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T14:59:59Z), 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/HKG732128521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0255949c088ef3a6dc1fe68151c9e0d04a7bbabd947e93ee9f19ee8012822dd0. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/FRX762102418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2d7fb97802d17d482e6a7870fd3cad073f8688a4b80a0822d7262a2f0c3876. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/FR2X42256092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1698264e3f432ba6c16bd56f73a39abfe4ad09b828f81b055764f539324765ce. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/FR96X2294107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d98bd26f26c347c80d564270c2b8c4b3a157cceb1cf4fd6f655794fe16ef83. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/FRX202242827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3134fff4526faa8d3fb4821d5708aae187813ae303e7973f8b5cd7554c89a0f7. Chain 2 (Bitcoin): anchored in block 957852 (2026-07-13T11:25:45Z), 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/FRX452328756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed6a383e2ae91de27e194370fad90e980955fb2e54bae4a3f1482fd8966d6f2. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/DGA0M2381470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa7f95150d8c18e48c5f5234b81299b8c4ccd29a1defe5e266db296af521f327. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/DGA0H2372539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15a3a3d21a75ae79893481049cb84e3cfe22fb57f50c9a6a56661ba294d1797. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/FR10S2426610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf76d59f44b5e381cc888a21ccffd673f71ed13c0ba1b715e33ba1d24ccac55e0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CNZ632200629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7898f580447b0e3f40bfa6dfbfdd6474c5e964bc61b483b7b35bdb21c6840bca. 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/HKE672400260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1904ba77449f3e1568f6b6c9ec19d4b31d57369b6451d586cb627cb1aefc678. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWAE31902341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91edb468693106225edaad9405fd888d559bba5d00a0ed9337bc7d68d07d741f. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/TWAE31902342.
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