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 0xd0ce9accb2310d46d18bdb4a67dd455491f57b4844915d381e352247fb3f4ca8. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dca9abc4-66c2-4c9d-b858-c760edbad696.json and https://artists.proofprofile.net/proofs/artist/dca9abc4-66c2-4c9d-b858-c760edbad696.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 0xf70c36b7bbfdb79216143687b50358e09845c3aadcbfee0fbd64c3d73ba46667. 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/QZFYZ2408949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dad8b84e5084b0434879cdff6c9885a46a28ef437a6b62c894ad12669c858e4. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZFYZ2408952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8684de89c14d5cc3b0030aa0a586ef78b98e8bffd6d8bab3980ad50b3a77a0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZTB72267212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a7e63a8ff9363158d75460282f89332cc6e77c4bbe1b9b493aa81dd0eb2ed0. 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/QZDA42249034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8684de89c14d5cc3b0030aa0a586ef78b98e8bffd6d8bab3980ad50b3a77a0. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZTB72267212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef485c1e8b2d304f5f920b34deffd5d78668e0245472e2de3f611d2223bab9fb. 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/QZK6G2268948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c57570028c21ce0de55fd379d3abde663b8442e624b572aff87f81e7a1eaa0c. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZK6G2268553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbadb18f903b99acc0d4319e9def69a90a828f37c5a12f8d629a77daa2a8345cd. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZDA42249600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a7e63a8ff9363158d75460282f89332cc6e77c4bbe1b9b493aa81dd0eb2ed0. 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/QZDA42249034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88358c70e40a62cb5d83cecedd3672561d883690e11e6ce0875d6918024ebda5. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZFZ62275854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa847fb6d0cee45121489b8615eba2dfbcbf6ff19fd6bae8159e9798f1df400fd. 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/QZDA62151900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f62f70fa2fde3ac36b88fb3626dea5eda4134bee33d97e9dfb1f0898b1422b. 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/QZDA62108182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5658306b852edc442dc6d88fcc609210a3d720b6affeef5963d484dc75aa0243. 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/QZFYW2153813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ce8d163fa1fbf66d29f300cd56a0a316584d8db98cfb9511009a5bb918ed8e. 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/QZNWX2027452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe734816ff3eb00a52fdfded243881f45e4f76420698450c8fd464ff15f0d917b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZNWS2048199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa05f02e6e25a4876208ba122b8c92028bdf29fa08624bc09edeba7e51c3dd38f. 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/QZNWR2020976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe297124d816aa4e74b7f92f2c059e7b2d7a13f34e7548cb38d2e58df52239930. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZMEP2036217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd428e4292b3ef66c354a59c588c57869105a19501c094de2078d4c08e5437be1. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZMEP2017081.