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 0x05501af308b63b87d2f5dcf9f7d07b38b3fe3d0e00d96a9504a54f4b6b24c539. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b049cffe-db9c-4a0c-91ad-57f268edc5ee.json and https://artists.proofprofile.net/proofs/artist/b049cffe-db9c-4a0c-91ad-57f268edc5ee.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 0x7a9e45eb956e1947d6b76fb8f899ba4505abdf3eb490968b6d1857fc59276db3. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NO28F1506010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011be4719594b1de9a896e74688e5e256b85fcaeeb6451df37c33e5f93b812ed. 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/NO28F1606010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2c536b5d3b451fa3b584a3dd9c506083d265606576d8ec974e13fb7e96fd18. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/NO28F1605010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5dd4a81be333f3033affd42227fbc7d36f463ec33b6482ed038e4a618a64746. 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/NO28F1610010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fa3ee82a6896b028ffd9fbf7c7f5df4756e77fd38227b4e4da0a03b846dc9b. 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/NO28F1601010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b1c1493d3c4fad5cd8b22484c1d137f00f81279f3dcfb508d8ef5b0e382522b. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NO28F2106010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93181e52249740a929328d1d751b0ac90ae1cbb488a7d7ea4834c111d23d93a7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NO28F1707010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a4bcebc809c7e8b6a00500efbee15f8bae5bfce79f9128a6cbf65768aebde1. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/NO28F2401010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562b4bca300ffd2bf7edc009380fac90f9a60f2f5488c06ecdd9de3feae1e4a4. 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/NO28F2306010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6e0ee0dce724d60adb3839dcba95b90daae8a242c0b17febe17a6f94e8852c. 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/NO28F2305010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02851d7bd3153f9c34e9ffc00ed728d65aecdde55472623626ecbc9d9f854a30. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/NO28F2301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0aafdc62af1dd70f3eaa423aa3a0c8cd01f264a3fced163b234d7082365d0f. 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/NO28F2203010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8afe06a367e26cae9704ba98feb2283655665180d9747fa21ec23631b48421. 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/NO28F2010010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a71f88f3c3b94d2411d27d915777ea3ea70cfc8f9d69015f39073766f98cc3. 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/NO28F2006010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc5321c1d2db7ea9c6f84c55b0e72789c46f5f9dae92099e065fb056942a465. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NO28F1903010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2962acc346345b52f52a4882da76b8df1f62485519b949735e9cb8830a82a7b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NO28F1901010.