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 0xa898d4730c66236175cc01b98519ffb804476a47c46c2586571df1c8dd6379ae. 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/9855919f-83d0-4bf7-bc7d-8ac14cb8e26e.json and https://artists.proofprofile.net/proofs/artist/9855919f-83d0-4bf7-bc7d-8ac14cb8e26e.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 0x0e7076b94b0e8ee8c35e11926fa3b8dacca203ddb6a25ad6e86ab5cd9ea30789. 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/DELJ81605544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x396dfeabb6b575d315040413536d5775fca5aff43ce38d3cc0a9320038b19835. 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/DELJ81605545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1475d8336de327f2729282d5f6a5adb69d88dd20685e8ac8d1815efb819539. 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/DELJ81605546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181565036ecdd4c8094e021dbfbb300c0d99bee0fdd5043434a651f8138fda87. 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/DELJ81605547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed04c1365a6584c9eb7e7fc88c303833ffa94f87da7cba0d7215b1664a07443. 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/DELJ81605548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e4eeaa246cd46793a6467d7c8a52de0cc9a353319673a6436d62f74c196b98. 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/DELJ81605549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf29f1ee26b37d435df3953da62fb78e08853a36f419a7e758a317613483eaed4. 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/DELJ81605550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee8b18994006ba2639338b19ce12b84fb2c9eb1c0eaec853c6afe2329d93c8e. 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/DELJ81605551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c3534bbe0a2f7828cd2c74e3ba56729fd78f1c5da80e1691ac0e36e3ae8c3e. 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/DELJ81605552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a6807036de3a1d0f20f8934349b4bf6a1aadbdada24f2ccd93ed347c1963ea. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DELJ81605553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3744bc4e98e612aa78d0508d65018403046f147b04605c784d4e4deed261f3a1. 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/DELJ81605554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120b7edecd65bd0b96ce0a81f0d764c7abaf54ef213e99b32286b4bb4dca175c. 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/DELJ81605555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d620c293d389dbd98905659f3befeb237043b088e79ba8f3071cd3968ee693. 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/DELJ81605556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4aaa7e65455745e33630d029e073974a01d558e581b9589d4fd7ea5c1518fb. 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/DELJ81605557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64dc3fcab33ee7c854fcb294ab66dfa414a7756cf5684a0b094f2d9883a2c5ef. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEQ022281489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e85ebf519d5d7f491fa3d3a0382bf1ad58aaf08499ab369a8cd95ca79bc922. 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/DEQ022281490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d1dfb00dc0a53199d7f558710b28eecf3c2398331a6da1c487d7fe4d5eafd7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEQ022281491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc933a935c9eef93e80faa4f451688d3913af461b4caba722ae2f86c02ea9241d. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/DEQ022281492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945ec222ce873d5f4ce7de757bc506e73fe7fa88c2897a448e90a2375ef40889. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/DEQ022281493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ac3c90db766b8e010c35e4f59c61e6be3a12b6687d6a31586568f84881979b. 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/DEQ022281494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3e8aa1ea1b0d3730085712fc61c7d361dae2b1bf887aab6de2d661e43bd510. 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/DEQ022281495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fe6ab9fda63abfa9fee7ea40a915cf9de81fee7fff3e5385a58401798bf8b7. 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/DEQ022281496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7acab10c146975478dd9e66c2961e4d9a08d6bad72a5590e0115ab64d5b7d3. 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/DEQ022281497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687335b89c7896d13a4e81d81bb4c98b2d0cc0c1d0db0b19d283c1caf3147999. 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/DEQ022281498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a59e2cad94a6d724f6c8a5f3711867707b68bcbb9183a703a9327bcd2ed13de. 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/DELJ81878309.