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 0x55f3fb0258b153848d61a2a11c2f429342cd7df31a736b181a73c8278cb55a10. 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/e088143a-abd1-464d-a433-fe7f2ba15ccb.json and https://artists.proofprofile.net/proofs/artist/e088143a-abd1-464d-a433-fe7f2ba15ccb.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 0x6a8d0fee8bb7f86fa959ac223ffa6a2985c121f915680234bc5b48fac8026792. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZHZ31957979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f72cd234b340927a51225056eb8ea3bfde740336598e190c9c2bf034581053. 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/QZHZ31957983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf9041cc2c1a578c61c7fe59bba5a0e89f86a4a1db1db9b8a6bfadee4bb229f. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZ5AB1837645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b288e1b5771b4e8fce2d71245fdb4e0f6617a405418224664e38469fe6127a. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZ5AB2010135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b9b832ac2390bc6135374a8c12917039a03a5f003729aa45aa2f4544828093. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZHZ41923185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292a1c7bc942853a36a260a6ed61e991696bc97a4bb84ba692852123dca9ad0f. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZHZ41923186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d2d97bb0cfc86ca7b7a9ea481703c9681aad51ea60721269120e5f8d1bd127. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHZ41923187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7c04f379b5c0c3b8ffcb3273cbc28cadf563844d6ed6a8418151ae68046fcf. 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/QZHZ41923189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc8a343c35fbab743de95430f052a15d4e44cb188d648eb96801e7edeb8c45b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHZ41923190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7338b89954395b8d418a871c106f9e0cddbdce1b66960de38e94236909591e3. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZHZ41923192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319043bd0c45f2e9ea01dd93b4eea5ee8b9f95fd8ab5e7c46fdbc4711372069c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZGLM2055001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85d4b7a7ad2a5b3546b68ff59b1fdb8f8233d4127cffa4761adefbbc2eafbdb. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZGLM2055004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a82efcc0c24a4aba4d83487ceb8b35d73fa7ab5dfa02a37cb21bff4f436bdf1. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZHZ32091988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f2f4915cb2f911d38542bc7cc92da260bfb3b9491435c71ef56b9e828e62df. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZHZ32091989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906b992a24eb9e56d114033e519bccc06a75f7f6a7acaf77d55d23fddf7bc566. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZHZ52088371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cda019b6187da52c83f93bca44b2daf6c4ff2f69a6bc1007eb1a49b451ab5df. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHZ52088376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71177c5b923e9e4ebce4f88d6ea70716cbd187bf20377601682549169533a036. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZNJX2208104.