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 0x1fdf40e1108749befc3a86e31b19f35fb3a176f2eac49b1cc027e4ddaad444cd. 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/b2053f17-cc3b-4ce2-8456-6c5658d94c83.json and https://artists.proofprofile.net/proofs/artist/b2053f17-cc3b-4ce2-8456-6c5658d94c83.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 0xc49754d3a92a18162d11bc063145380eb9f9c2ab592ca2d366c76813a3168750. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:00:56Z), 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/BC0HH2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0f626076b559b7244dd5a12285d0fbbe5533825e58afd3eea6f2c3439e07a8. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/BC0HH2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8e57faf1989477d45e72cdfd87f504ca33610b4822e8d5f83f2054a4932156. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/BC0HH2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de5940c3ba07af9e19a9d2726da7ddd8a9dda81b651a69934845054c9bbe739. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/BC0HH2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e919c4929654b734af6a1667f982aaa31874a9202ab58cd705027294b53ab53. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/BC0HH2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc6f8b87063ffb6cf492ab3cdab8b76838096af49a6381812caf9fa0bc3a9bd. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/BC0HH2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f2cec0f972467ae47b0daf718f55cc9c7e617a530885f31758cb7de3b5edaa. 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/BC0HH2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e8dfc6e512b0a76038cd5e330f13d1f47825405d3e96254e2642b00596c793. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BC0HH2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ead53d35ca47e25bf55ea3e61af0b10ef99313ff255374d09b68412be73bbbf. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/BC0HH2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548346797df2b2f9a61bbd7529880e56a8fd3348e683953da54cc4aae11bcdcd. 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/BC0HH2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd7a691e6ccc9d2ec32217c9311a5ee250735e706255bbfda2cd7cfbc34ff6f. 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/BC0HH2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907d0f47a3ab4b03d0fd533e4dd598bba4832cc6237d157c4b28940e6e7ce2b6. 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/BC0HH2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba7ad481ab711e99777946e03d65c4af82b849bb47e9269ba6c85adb43b2294. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BC0HH2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddabdfc2ac47566ff094f2f125a5c78f4a0df20559ef4a75498b213ec813942. 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/BC0HH2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548346797df2b2f9a61bbd7529880e56a8fd3348e683953da54cc4aae11bcdcd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BC0HH2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da56181c035e2b14dfff7a8d2d5a90edc29285fdc6b041cf1f6c806d4491bef. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BC0HH2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fddacff8544b5082d8bc99c1c4351ba6e1d11fbf4d08b1530f9c8cc72cadcb8. 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/BC0HH2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b753b470854170a3209cf6391e90cd0ed93ec09685198a4fca6558c1950fa3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BC0HH2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3d255f936d7dc0569bd7f98f61938727c06f77a1022a828c4603a741850a3a. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/BC0HH2500001.