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 0xfa7e4ac28e0cc57caaf9005096df9449e2e0a15293a25a47fcee5d5d80093670. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3ab56a7-1180-4f89-959f-8f4884f95063.json and https://artists.proofprofile.net/proofs/artist/d3ab56a7-1180-4f89-959f-8f4884f95063.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 0xa8a4672827d16f9dd1416d22eb4a552231dbc3cdf2181d7bc2342c7789ae2448. 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/ARF119700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d411d67c5b4b0fd6be82213621e77b83bea903a553f05f4f4ab0d4d4c759e7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ARF119700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4971e672f38b58dd1d62054f0222f79a38de720f15785c293d3827cc0add562b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/ARF850110001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba815d8e7a7aa3ce4a83bd79253aa986d78f964453bc8757ca109bd9187e706. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ARF850110002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3889a8951170cef61c111f65d85e421e96412fa61e9924043aad6fee2ec360e. 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/ARF850110003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53508547e9cc4a64edf318e99b22664e23a839a40de1b74e5a8a42303bed2de5. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/ARF850110004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144e7e2cb5058f3938e2350a7ea603e3a250045b3481344b9d9b584ebcbc4a5c. 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/ARF850110005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b15c6983ff0817a9c19cad3897d39c6ebb5b01ae54e254a3999d7c52a41f55e. 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/ARF850110006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf728402111526e9ba05bafd13a1045068d1411a46aa210f993cf209603999ef0. 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/ARF850110007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023ec3680c1483f03ffbac9d5ccb24790a5a361edab8ec378e60837cdf057f2b. 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/ARF850110008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2fcf69bdf820ebeaeed9bf4006975d0662c28e2ba46f293c83b00c5cd205176. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/ARF850110009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439e5268811c5e059c3b48ba61672632540d83bd4d04a270f91cdc79959964e3. 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/ARF850110010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11972285c783dde838c46f9be0df2fbec4f0f967d8b6e1c6da6f04b6b681ad92. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ARF850110011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dbfa7947fa5436c468c44fce7cdbfe10bda31ad62b1df2e7c6a5a485ab8de3. 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/ARF850110012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9613c1c25370bcb71afe9dc90b63c4f081b025fd001daf3ffc5035e0bdd8cac0. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ARF850110013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995984a36adb71959c0168e22e5f1aaa27562b00bef3bf75705e4b68a92a1a61. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/ART0G1800575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995984a36adb71959c0168e22e5f1aaa27562b00bef3bf75705e4b68a92a1a61. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/ART0G1800575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f76f9872c78768b186075c6ef4f67280d36c0afab1df68b12a5650941174d79. 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/ARF841700088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c53b342bb08cd92b4cc4d4839057be09ebb3afce8e4eb760c3fa934f57e771e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ARF841700099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ddc9292ef1c7c99ac137cf9331e4d48d92f09be1cbe347683998fa70fbe5a7. 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/ARF841700100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386c37ed37dcf2f6673809c5aded3148610f60ceea95a681d6a4db030242c33b. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/ARF841700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208cfe595477fa7bfb0c703d1222d7d6683fb9f5314de0d280fe170b7473363e. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ARF841700102.