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 0x3bff99bdca532e9b2dfd9ae169b5c7c10dbb6db48d464bb963cfb9752f5be8e9. Chain 2 (Bitcoin): anchored in block 954139 (2026-06-17T21:12:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7e91cb6b-8569-4679-afe4-ee8b94bd3231.json and https://artists.proofprofile.net/proofs/artist/7e91cb6b-8569-4679-afe4-ee8b94bd3231.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 0x6148201d12ae1a97e7d3ee33e95d7d309757ba07e629f6ba56e6751505e1f30c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZS662200233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4210fbbf2c009b97343533abf1a70eba18d841afb8058d8c6d63fff3ff137c7. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZS642216038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec1ad7684b7baba6f1e0c2fc596f35e62a5b7882cd3af4967a27cf6c401300e. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZMHK2202159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3252121869d0c3cd3b7c3d197d85d9a4bc5cde33f815e0cd6d55421bd0dacdf6. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZMHN2222771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b76b4915df8517040f7ff34c79682b4794aaf2e481cf60e43fff23b8af64198. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZS672207262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3b048ec5e63d2f295e9fe60793dea17537ef59f4e88559e87318356aeee52a. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZS672289547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9944f9ad6e6b8fd96da18e248708ac80cdf2131045cbdc6d9717a8ff2cdf2fe5. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZS652293282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73a41cd4802d0af2dbed78a836c5ae57b5d28b108c1b35e101d3d342dae0868. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZNWR2127626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24dbb65b14e1eca435196632a5174d1b6a9e73a700c7bbc1611e6dcb8938c797. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZK6P2134211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7414fc94f49dcb9dbacc7bb9701475d2ae8f2c6e444c1898ea5cc4f403fcd9c5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZES72148857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6430a56a83bd93974e0ef34c518ee768e413d8e649ed8f6651a489f927c056f5. 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/QZFYZ2072410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd9d0af6e1353bcae45d951f619f4db8010b7cefebf98a5a6d556ed3f9451ff. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFYX2027480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af87014f90d96a8e19d3ef91978e71ee63251648182af12c6e1e11c0b38272d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM42K2051668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93fa868ca60575c727ee1769bfd7ced61d0a015afb4183ce8d134a9e681b934d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM42K2015686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97ce031936da2febcc5f3baf4b1d8bd9baa337c43b5e119c763604dc38ca329. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM42K2048478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2b37ddef5e09f32f9839ec37810ec889742f5fa135cebce332233cc873bb54. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QM42K2001671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7dba9ba3641191a3c9e8aa842eb32a04234a7e0034ed1bc0d43ecc6207e0bc0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZS662223797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10f9b9bcd3294395e340fc2a2144193de042256848924e6650bfe0e8c175ab3. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZS652288738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53dbea4775aa93d921bd81ca76d4906495b27843edfc1ab2b8f951bcc8f4b9c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZMHM2285367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074ceede2447ec5aa27270d1c8ba7738fe0deede76b42fe9d4088ebe70e92b1f. 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/QZS652201205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9115267ffcf26584908daea7235099a9bf2fff035ec06b42cc4e2661a4b82e2. 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/QZFZ41939082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cae416d5b08869b91899fad0b9cc776f78f423bdda6ae0e41e0c8194e56b1b2. 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/AUBEC2310831.