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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181dc8609ca727246fbe85ca0d520d30ac515b44c787bf6bc71a928c2c3e9de6. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/444280e7-0c78-4107-988f-d56e32d2d8b0.json and https://artists.proofprofile.net/proofs/artist/444280e7-0c78-4107-988f-d56e32d2d8b0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d7378f754f500680183fcbde9383913a8f8cac8bf4841622b2c2221edfc203. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/HKI491514101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b0224eb0b7fb19c67b41b9324cb5a4577070a444af39abff8dec06666d40ca. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/HKI491714103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a15f0a81ad5d02b18fbac2de4f2310a0d9cc868b0f9732f825032dc595ab1e0. Chain 2 (Bitcoin): anchored in block 957919 (2026-07-13T23:58:45Z), 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/HKI491814101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cb29126f9b610b60ce1e4081a217a2819deff2e9e1dc152ef7997301480fd6. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:06:04Z), 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/HKI491914201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104efbcfbdddcb9b11059e25955ec21fb404cdfc85c728692d09a9988a120ebf. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/HKI492114201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e84a65aaa3dc4243d24313f0c7e19e83baea389a77383bfca8bc9a049dff1f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/HKI492114203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b199e4a62aa76571af4e1d9901ee776794a638f4aa045f88e8d12df5a0f5b2f. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:09:18Z), 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/HKI492114205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5398bc69c6c5aef328ad47dc09a0786795fe4b6db59a2483d1843cc8c35e0767. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKI492214201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf301b1b910a6b5c6d7ac765809618bc951b3704425af7ad8adcc59e41dbafe4b. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T15:08:44Z), 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/HKI492214203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104efbcfbdddcb9b11059e25955ec21fb404cdfc85c728692d09a9988a120ebf. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/HKI492114201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0489a8e2f832a123fddedba8e8d80685da0f9ae0ce1efef7b8a751d12ec2680. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/HKI491500091.
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