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 0xc3cf7ce1351c79a420b2bdc372952ce9262682f00213c40a84a2fb8ff1c95b9b. 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/a6d55a9f-e435-4b84-8688-f4904830c785.json and https://artists.proofprofile.net/proofs/artist/a6d55a9f-e435-4b84-8688-f4904830c785.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 0x662c1d4aee706100c758a57aa53354641f5b7785d62fad9274db5e8791db2d0a. 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/USLD91744170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4060750ed8f0ce8c1515fdc82c230642c62c0de4f87fed5873cb0831e516c11. 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/QZK6G2045267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee42da2266e475801f0d855d3cb0cd9c66718e6e3b8da6ce55063b4720acda6a. 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/TCAEL1979374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02cd76a81b8cb4785d4dd1fbcc7c4babd35833915e7d24ba1f1ad65f896d9d1. 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/TCADX1880429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a74f3495b3e9e9558c1602504a799b0d9f3756ff8f33980cfda9d90fea4fbc5. 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/TCADX1880434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc76780f5d698b829338e69e33017aa4bd3f03a26d83f8c206c0dc702639e9af. 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/TCADX1880436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb8e47b4acefddf7c0c7e7e4a5be0c1eb93fca22bbe423dbf2f8f6c685d45d7. 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/TCADX1880450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a57019d0b25bcb49411d487c5ac26f18dcdb3d6c9484ae489707600820d275. 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/TCADX1880502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cdf678ae37c71a66afe555f5e4b68c2b8566b5756117438164de62188303da. 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/TCADX1880510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc306b84f191265e1e6ed25f3f725a6ed6dca0674a787155127e850bb7469c15f. 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/TCAIJ2485978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12620af905b9a12ce1ea78ea637b0f1bba7b407b7332d84807bf176466eb997. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHNB2398982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033a5cd588a73893f393572415c8bbfd1859127adcceb90aebd2f93f6d43a248. 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/TCAFM2183320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c8a9d5d5ed2644d03b7856efc4aac972b9a19fd12ea082ba2af02d8a290531. 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/TCAEC1975780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcce894118fc35fe885ce6361e4d9d3fd188def421f8f5e1c48df0dc3e47e6f. 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/TCAEC1975798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30bade23359bd57f931958c2059c1522ea19ea4d18d0163e6a7377a2eeb6537. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAEC1975809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519fc0b76dbc0e4d796abd81fb57bfd49c01f226bba2944fcaa0bf03048b1705. 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/TCAEC1975813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2522aca1dca86f57c89413c2cd35d2b55d45d8512bf2f0d4cd117637ca44890c. 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/TCAEC1975832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e589baab85761ff7d0b9a9df361bafc353938ea3344e73adf7b77c5fdad115c. 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/QZMEN2458285.