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 0x5fa0fd793610f653e9f980539b53180c8ca484fa3ab4940dfcd855f5f1d2c3e4. Chain 2 (Bitcoin): anchored in block 953923 (2026-06-16T09:51:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c955ce2-d046-4156-aa92-9a88f36fa210.json and https://artists.proofprofile.net/proofs/artist/1c955ce2-d046-4156-aa92-9a88f36fa210.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 0x6f32d41835a93ebb92913ee820190a8471797272693dc04f1056cdee79d8fec6. 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/QZTAT2316203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbd0d0af2c351ba808901ba79b22292916f8bad8dba69a0b251e5056c2090e2. 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/QZTAT2316205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a83283fea2f50d030adaf0ac807d4fe4646a46a38fc58f0e4cd6a980bb7542. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZHN62398213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7f997584cbebba2e32c1cbbb488976cc1606143eb4631200ebcf68e5c39091. 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/QZHN62398214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054dc118ae15259a3f12aa23704c28f2fa518c25cfb13785daa830b91ef2bb17. 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/QZHN62398215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e3dc77264b4251355810ab6dff0ef9a5ca498e810e58cd12be0c431ffb79d7. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZFZ32389541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685611e11b45193229299802203dd87ee1d62631058dd2c51a57dfd545e5e921. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZHN62309052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9871b2479d589fbb997ee77d409c92b1275d23ccd0d17af9404626fc873a895. 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/QZHN62398220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65de755657539edc71dae44ebb2b1965691a2885d61bbcfff21e40f40014167. 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/QZHN62398228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0bd9f0f2a772d1853051d9289956ffbac8cb2d369956a429c9affa78cb3a5b. 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/QZHN62398229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7bad9d7a6262a48dfbea68212fe03c9d3844a87a053b792cdc34cd1f66d258. 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/QZVEM1882518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68ba71d69ea326cd4210e0a90a574167ee580a2f330aabbd069d44aa1200c4d. 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/QZZ782409821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f55cd9e09e9f9dd8179f39a14919e250df4cccf7bdf9822a6e9a88ed5e22262. 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/QZWFM2413452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8adbc9acdefe06dc3bb6063ec5a75c1f5ecb8b448b9749c4d0f215e6baf67d0. 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/QZK6G2446667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b1bfb617525c3fe72cf16464ce7d79650af420c32b9e1ef5afebdc7641fa69. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZFZ32412745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929d72beec69ebec0fcca50870ac6f8d79a3a2d205f2ff3e1832350df60ae663. 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/QZES52342253.