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 0xae13f9b062bde0a58b912dd45f94c79901c968450fd8c9351e5ced3dd33f6567. 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/24c99ad1-bc9f-48a0-b641-c482c22f001b.json and https://artists.proofprofile.net/proofs/artist/24c99ad1-bc9f-48a0-b641-c482c22f001b.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 0x16ad853d0457b80d39719794188f9abe1b940c5222ee8f75c420af6211cc36b0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ES71G1847869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da0e4420574ccabc44ddee013f1d215d839934673e9ab67e50bf4bd91d72a73. 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/TCACK1547727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb519cc5aad85f46305e8e63297e4db818e42cb17881c095ed6f01c335402af68. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TCACK1547734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ec14a6c9bb3cbfea8c54320e87db372644da5ee78ca1883b8cd0ce1034dfe7. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/TCACK1547737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3f423c594bf40336f0461f0d10bb5c7993872d45ccdca2a0085784cc56f972. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/TCACK1547748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872889328098cf2b3e97a85b0a9d115830b5bde46f44e0bb77423905b500c910. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCACK1547751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1271f9235e02189811a4fdb08466be9bf08a79afe4b0480b8051addf042a4e5d. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCACK1547752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea651c3a51d0bf9293aa606256afef50d34c633d2886c8f9a6c4c6b050e9d10f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCACK1547756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d066d67a41ed7e85285378028303616a49e829d3ef857997ccb2beb42b7e13. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCACK1547757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38daa07a9e01278d6897d7dfa2aaecc73b89c9c4de047ba9fdf336e0d69abae. 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/TCACK1547759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af1e45acce7ddd6bec1b71c8c72ee9e36e0b6ecaa4955016ae2bdb37c7b8668. 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/TCACK1547760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d3a8ebe2839b5f54de2e7c5a4583f8cf6e3cf92457f31b52ebd17d2c20bac2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCACK1547764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629ff55e1d30df321c7ca27c7992edf93a45e94e703ccf68f0e7ec77bc477917. 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/TCACK1547765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5f43d72e6377f786099dc4128c7b71718e03973411c1ad8f2f326760557ca0. 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/TCACK1547768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384c85d55ead4316063f335c831df4cfdc65d5f1ad64d9c52fe1839ba99d8bb7. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCACK1547770.