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 0x55980984f4415f8f7113874b53454574a3fd1ea3f9ffc749c58a48c98eba2bdc. 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/291ae8d7-55c3-498c-b99f-10e309efa67c.json and https://artists.proofprofile.net/proofs/artist/291ae8d7-55c3-498c-b99f-10e309efa67c.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 0xdfa7cf5d03e6ff212ca73abe1aa7d37b5c9542536d75222e8823ce87532e7561. 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/QM6MZ2105332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585c5cece21c264d309c57dcc048c20c9f369e685df5af8f30fe47e5b1fb3ab2. 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/COC011933368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8bbf8d37baf87e4a498d85ad0f0768029b95d0d531c8af67661e2662144f2c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-21T17:26:44Z), 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/COC011933369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af6309403c53416bf581a6b839ee0e1ad3750508f92bb2e9936dea41b903535. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:11:09Z), 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/USUM72008304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561003dc0b15f414fa25e2db91f8be6b457ca9760c3828d220303f6ab39896b2. 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/AUMEV2490697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e308786da30f0ae77d85f37c8a36db30c7610c143e7f93e04f6bf52f1335438. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/ES71G2235888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418c8e9a15dd6dcc0f490e8076febc3d6e418e1f294770a32d5392a2749374df. 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/USUM71921710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6403b338bf6224ae3677bf2cf3296f98f5db1e9418b5d8e8ca20dc4f6ca782. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUM71920584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2031cf68840e9eeaf83d9acca9512933c047da066cbd8d1c196603eb4d76e20. 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/USUM71911885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f033aab4c18ccbb2d7ca3072ed12d3fbe1e37c3830a1076b2d824f444b9964. 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/USUM71908371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a87b68fd5b1c4754959ca41dec14d700296378940ed15339d341940bdab768. 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/USHM21823738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22f7a763ad55fcbc9038d9a14657522fbc57fc5dc6fcbc6579d91531c864324. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USHM21773206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac263ed12446926b9f5bcd8f1fd9febec92f5f59d03345ae13d5fd57a8ca90c7. 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/USUM71918061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e3aba81f99b7b5d2f395a9895f483775fffe20b67db72fa8601af370455dfb. 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/ES71G1944113.