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 0x00e9ca0eeb876b02cb20968c93ffbd8262983cb90862a17d25f62f8dbf8bce87. 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/9dd4ac48-9a7c-4332-9d3f-cbd139951712.json and https://artists.proofprofile.net/proofs/artist/9dd4ac48-9a7c-4332-9d3f-cbd139951712.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 0x602ef575a13e2bfbc65e52c41c93392bb481f71ce40b16bb7e8534cd0e10db86. 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/QZTBE2436128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6038f699e3aaa2fc3803928d87d5aa6b6e1f3de065f470ba276aaccb058c4e. 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/QZTBE2436130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbedb26ce957e5288fbd6b053111738e8472afdae41b0dfd6f9f12432c9b30a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTBE2436132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a974851b34c4178169e8225186a24b48475a8fa73fc81e55ec2e08071baf8c. 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/QZTBE2435494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38dd1427df6fa7f19de324e8d0068c4e7a443e9f02a16445ec6303e5435905e0. 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/QZMEQ2198163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173c418f979d90e7232a170429cc610d768d1e4779edf17c14000adaa9e34eab. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZMEQ2198164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5a33f9dcb8d9671308ca87256970b6d53a7f89b41b8f8c1e2508988f537059. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZZ7T2464840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68cc2fc3bc0f0c29497b037d0ff6a2770bb10be644c86369cbd3ec1aae605af. 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/QZZ7T2464841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa761eb32d714a1df652f487fcf6da71e415cf33a5619edfdafa10bae4af02825. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZZ7T2464842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151527c56c5ca354289e04d2bbca225049648cad409a7bc8605e829133f28a26. 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/QZZ7T2464843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5058ad7c7f071f59be3ba79fad9c0f415f007d8c16c1cd7a93d436f557c900. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZZ7T2464844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6d96ae6fca0f3f966fe5fc3caee21bf053de93b57d29bab0d5b65148d0ce00. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZZ7T2464845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c706ee8f836fe98081f52f3882a5acfb2218c4de2438a273da0223882113a22. 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/QZZ7T2464846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c0f8e4aa7fd239d3840b7cf76885061edf389c49e15e4855bb946db13f0b63. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZZ7T2464847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab14e76a666d0cb68d1b134b3e6d3ec4200fca038853ed87eabcabe5f92f257. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZZ7T2464849.