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 0x21cf93c5e3269ed9ad6e6bdc08a1faa544cbdd2f9c3d59435c3c9dbc4ecf9da5. 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/93446310-b151-4074-ab5e-3d72ef70379b.json and https://artists.proofprofile.net/proofs/artist/93446310-b151-4074-ab5e-3d72ef70379b.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 0xd556e058716e5bf6cca2b38fdfb803d351a362fac9eb8c31a20123a4512307f3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRX281985484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98338b1fe90a5611924e6450dd5c02c130d9a4184d0b50a2c29cafcef1d4f533. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/FR10S2018871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd556e058716e5bf6cca2b38fdfb803d351a362fac9eb8c31a20123a4512307f3. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/FRX281985484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf774781cf3c94b2f4d6a0952e3a8f0c39c4a8ee3bdf692b93173dff24a9f2d3. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/FRX202033553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6378f1813b090ac0e8d2fc392892c9168de893145587d335bece4b22db580004. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DEZC62003880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53367985a7f20f144c117428ee719f57b2df8735020aa5715c67da001db4be4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DE1CZ2200200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c8eb00ea764f7ba1834ccc50b012e1fe900e0942ed5e57eaa85fea04ad403e. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/DEZC62340818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0e810e301768ca270a2c4bb20d0d9dd2b9d82fd52f7e03b07b6e869ffab19e. 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/DEPI82208011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8df575f9471454e1bd25bd4606f261138554adf2e5f52dc66e8afe1f7455eb. 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/DGA062082237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191365c83e0f8d0f965b8b5a005b303db7d570e584cd879ac29f4f90f27821c2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DELJ81613854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf749e246f741157571cca67d87a8c5760d37f02888a2c61341a6310f855586. 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/DEZW82100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8a14705ddc6c879dc0a92bc80df87288c069529d92ada365c51f46eb6883b9. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR2X41723873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b74eece34f14fe831bfadaba82e98dd0a59fe25ae73ad35a3a50072f618c5cc. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DEQ121425957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12f6e364d1a4212ced8c8720bc45eec0fa193ad7b7483e098040557827ab732. 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/DEKF22200640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068477d97577eee57d29b3e0f92a11e97e04fce4d3697bd90603c9609e335684. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DELJ82095227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471eb15cca166103f8d351593185beea71ecc061c517fc9e4481a06f395d2f1b. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/DELJ81923938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b5d22a7e61a93358b41ea51409bbec53c1f9a6bb2d4fb98093d6be67d3ae5c. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/DELJ81948239.