A toque ( or ) is a type of hat with a narrow brim or no brim at all. Toques were popular from the 13th to the 16th century in Europe, especially France. They were revived in the 1930s; nowadays, the
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 0xc3da37e310f4c0175895fff50542071e4cd3c16d6fd183b9133ddaedbfde516f. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/94a224a5-b024-4a39-bcb1-bfeda6c3fa4d.json and https://artists.proofprofile.net/proofs/artist/94a224a5-b024-4a39-bcb1-bfeda6c3fa4d.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 0xf4c8e84c4ed9c4a1634103b270116d2f6aa43bb417bac062536ac7be80611560. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QMBZ91680842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd1cce228a917c90db15be342be68bed276bbfe6b0620fc2eb46ae2d56e0536. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/QMBZ91680845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae36bddc64ae36bf142f1d69608feb7c4c82e3528558949f8ab08ea17e857dbd. 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/QMBZ91680851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795504ff459bf6e0c34f4f9bc0c5a673f64829b4905ef97b1d3bf3c634bfa871. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/TCAEF1964631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed43209e87b8cdac349418cebd3c4d5f702639606835d7b0aa0ced0f2f60af2f. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/TCADU1827629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3d6a5077603d999b99308cdcaa55e8854b6a7c40b787f99148e502de362f47. 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/TCAEE1964813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfece1e4a730189fafbe92ec8ab969cca5d9bfe0186afc277b26d529988d7c69. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/TCAEF1965431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c292faf64bc7797ade42f045eecdd16ec82d29be608e63e3794fc7811aa5e9. 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/TCAEF1965445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20770437ef6c390d849dc7e2846ff28bcd233871fe233623e25d57e39d268249. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/TCAFG2005633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8e816aa818057cf9cbd89fe0fa051cb31532cf5ea406b9c5013111ae890ad6. 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/TCAFR2124118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d41dfed3aa0234fbf99b7367ddb8a84082723624b3ba03cda4b0e259b92257. 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/TCAGN2200584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe345c4461fbea056330e399fbce2f86a3927185a38ec6853676d8267b2d24af8. 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/TCAGT2382050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79d07d3b09a668a921e0aa8ca7a82a6f562683cd2f17fc670fbad904f71707e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAGX2360688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fc72130886ed3fe4f4653f17a6391b103b4c3bafc765e1fbfa2bda7602d002. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/TCAHL2386445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ed1eea4236070e48f9d2642fe8e1d1b525eeaaa0156925f48c577538561cde. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAHW2431263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee0edc697090ad826687b6df8ac62368eea716e35fb13b5d4676edaa6724d2b. 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/TCAIW2413162.