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 0x2eafbcb5df11a0ba2d534346105b956c3b05657b6a0c9dac9b5c0cf4e89f8821. 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/dac24768-33f2-4694-ac45-6e779f76b97a.json and https://artists.proofprofile.net/proofs/artist/dac24768-33f2-4694-ac45-6e779f76b97a.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 0x108cb3d7637c3263f03435d5f1db6d752125e1616304317e96d63e8b2f028c84. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:02:26Z), 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/QZNJV2111977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f7481ed0e6272678692ac00b2b7cdd45eec83721e6d6230c770da1f161ed1a. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-16T00:21:13Z), 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/ZA56E2306038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6df1d5001f7689d082e0e27d60689b707af0e74d1a2ff846b0189b88172f1b. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T18:31:28Z), 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/ZA56E2306039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5d21ca6e4545c0e46c634a5616dab88c2474a773e2360da6dfca4d31082530. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:00:48Z), 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/ZA56E2306040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8feac7a09a8633e5716dc0b12bb725f3f711740e7203a8ecc71ec5b30aaced. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QM4TX2520509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea4e54cb3a24cb1830b37eca2beab6c8b918f1cd21e0e2708daf651835a4cf3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM4TX2520510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68c7b400d93ca5c04be43ec795cd15cfc29f3604f53b0df27e194d058bc2653. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QM4TX2520511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11699d033e639fd312f56dcafd9c1b603b5ec789c6a71671c488026941d44a69. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QM4TX2520512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915e4f930f84f075642faed4691d5c8eda29b64a64b632a89d8968055d4696ec. 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/QZWDW2548686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd326563e53e0b1e0464e2afcf29be6c23476a4d23db721412f1e9273efc7b28c. 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/QZMZ92329080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1b2db6accb3aa2e98daae0797f68d2f13c8e20f51ad674093b2fa7a57389a1. 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/QMDA72450051.