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 0x8c55929de49b33cf7aaf15d6ca37e71dd5eaafe751268f05a33d4f9c5dcc973c. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8c31b01-06d6-402a-941f-a0d115c7fd23.json and https://artists.proofprofile.net/proofs/artist/a8c31b01-06d6-402a-941f-a0d115c7fd23.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 0x5c7ba7811a20afecc5f7bb9d01e05a7830fce5d8145200ee2792cc4a76557da7. 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/DEOV41100451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c9326913e8ecb6485b4cd353d3e8c52ff5bc803f2007cfbe214faaa0f8a5f9. 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/DEOV41100453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5064ed29fbb3549eccd7007176dc3f691b4586d1954f2f49ab1c4bc4f0b993. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DEOV41100454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390d028681c4b4a75cd922bc18ddd2c5a83aa84e7b9ec43788a36fa486b9aa2f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DEOV41100457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d8aa0dc57db46ea45878f4a94d7580329a0e5ce5cb6052e8b8951383b1a8f3. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEZ650610967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fbece571ea5ffc07f452c2a87a57b5df3d558c8418fc0d4e36dbedf5d99087. 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/DEZ650610969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b8b75428e5b42993b4f68a05f5ec9278db9aaf24cb7d231c729098a557070c. 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/DEZ650610972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b6a25167aa739d35d162d85844f95b2c7cbdf5143fd88b0c4f719078d4b05b. 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/DEZ650610973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6795d41542e0b64fd7ef2ddeef4d53c66b8dae4022a50f5a2610640d043d2218. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEZ650610978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9f132a588fa447204cdc08ae7bcdfc08eb4a1dda2e3fb31a1d312521978d71. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/DEZ650604724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec1b20922302e7dc58c1c23582371befe0f93edcd3caf1bc09a31d4523eaf6f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DEZ650604725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02643c46fda18fb49fccc42bee9e64bceda07d1135464a0f4ca425e40896ebfb. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/DEZ650604726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098e09bdc2117c09a886e901f3887fa9f468f771aa50896e0ed31d5fe14c117b. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEZ650604728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44be5f3ee998acc0554d6c8ec00e794d25e24ee5b66374b7564e9d57881fbe9. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/DEZ650604729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6ed20692f00f02c6dd7e379fa489a4f7a77f2221507efbb6dfa1c73d5ad17f. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEZ650604731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae8452059a23bc8961477cb73672026b07afcd005687aa38690aaa6fa9c1f6e. 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/DEZ650604732.