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 0xa0e71c2c35e411fc8d88d4f744a3b3abc2b85cfcea6446f691d3ddb734039a80. 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/128e1142-5380-4362-b79f-8b18a31eedef.json and https://artists.proofprofile.net/proofs/artist/128e1142-5380-4362-b79f-8b18a31eedef.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 0xd90ff28910d7629e3ff257f5ccd6b071a32cb078790b682347e767b91274f44c. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ZA1PJ2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2afa38b3cbad960db6842877324080c1e4a476adf952721f8ada66592da69928. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ZA1PJ2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d2700355a6ccd8d951255801759d7182713dc3c1c669b6638031e5a755eeac. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAZ2386369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cbf85968a9aeb1beaba20c6b94557726226357a0b8102357c49ac7873f24396. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:06:28Z), 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/QZES72534285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62bc683b9b2604f300ad6b5846cb7a6c1167ed40550824cd76521f7343146dd2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN42577126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fe3ded641bd8410aaddcdae3c3967c79d6e39669aabebb0836b0a7f5bf4bc5. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:53:51Z), 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/QZHN42577125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb6a7f4b8622ddcc943b27fb796cbd1d2c77110ee51fe278e8b8f98944fa691. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZHN42577127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f2c67cdc4a362f4698c08de278fac151b973db087557e17559f00a6c888c2b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN42577128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4544bdb198a279446ef3b982e630e72fd52ab60cbfcb30a9e4253950fcc926a0. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZHN42577129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190c064344fe0cac77829b59daa29d85810df1bde467f941abdade71e8e2ff48. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:31:48Z), 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/QZHN42577130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56159c7c5b8c07aad35dc5c49436b0c48c6096de261a7cfcd020cd9f329880f8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHN42577131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce6b8c1e5f5eed8846c6921cd702ae58e36a95c4950d67fa93c388479653628. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN42577132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeede16c3c6ef65d8b662b5243637989444a41f0c78f729ff436e55ca26593a00. 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/QZHN42577133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c04e324f03bf3486fa9f932dfbdf4fc1e83222ca8a06a6241552251383ea51. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZHN42577134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc6e399d1c8c3f163bb6b69551feadb51b2279454524cf80b7710efc3b0809a. 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/QZMEN2534153.