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 0x6c15cbac0b2bad3e29f4085a384d047b41eddace993b507bc00df7d32b137fc9. 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/0f480273-5c40-4200-81cd-8c3859513e43.json and https://artists.proofprofile.net/proofs/artist/0f480273-5c40-4200-81cd-8c3859513e43.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 0x1483e6993bacf2dbfeeac5e594eee269db124ec66f0015fc423d6ec9a6b652b7. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NLS9F1700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045a71148f44964de34ce20f7b80161298fe9161fe756886835623c8f0e0bf3a. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/NLS9F1700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c90a4203ae460dd779a2e68e55531469b4a2ad2f0f178b6cca86c68661798b9. 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/NLS9F1700017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f27c289d0d461f0361f2b97bebf94d958705545c64ed0ee75179341c716e4b8. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NLS9F1700019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8312174c63cdcf2c191d32d6b8e2c398dc88fee227fb3188403dc4c40b5956ea. 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/NLS9F1700020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7170d4ae8ce4b57e7112312b7a7f64d3009b07c0b1bd640327620c61149cba41. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/NLS9F1700021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3399ee2fc450406571d6786dff9c7a88ea1c0cadd37008623d7f1c683d0fd1. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-17T00:18:25Z), 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/NLS9F1700022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b70ddf47c0a190ba4730329fc645a12085f191ba82dd883f8652ae59942115. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/NLS9F1700024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8979e23d02f92bac1207cd1dd968367530a808620f7c8d9275aed187842d0ad6. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/NLS9F1700026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb527a2108bcccdee22c23ba2d671b3d7cd3567850c5cd12aef3362b101eb4e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NLS9F1700035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb615d2024a4421548287f2c7c43ef166d161de412e1ad8701aa5af29c539c3. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/NLS9F1700036.