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 0xe2e67331224f271ea56ae9ed2f96de894247cb8cd36306e516e108474e0ebcb3. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05a240c8-c155-4d3b-a824-85f7502e4d3d.json and https://artists.proofprofile.net/proofs/artist/05a240c8-c155-4d3b-a824-85f7502e4d3d.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 0x4563244741832b0fa4e514cb2bfcdcad84e5074dfd0437c38a8296724a6d9d55. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SE6SA2168396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8534dc8bdfa5e48d0cf89d40576487fefea1b5f12e64363bc902deee4b53c0. 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/SE6A92146435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf43dc7f9e258d654da85b5b78bad5f83d3b9ee241f46ae4615bb1b21e8b0417. 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/SE6SA2168397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792d3ae2432df37dd7fefba52944de6798574faada81fb8818da39b887225291. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/SE6TI2021530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae918791b3a0f78bea2936be8c6aa963e8f5ff0aa75e03fac9f6f3e98224c1d7. 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/SE6SA2168398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a25dc26a32994d06fb9ea934e1a026781a90e3534f280aa63e79ae5502bac49. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/SE6SA2168399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92111839b82d234600b75e9e30478881000df43d1b09afd0e5b0e693ce83b75. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SE6SA2168400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec4828abb53873e71b53d5cc019cc7a83cd2663a1dfaf3a9efd126a6d43d7dd. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/SE6SA2168401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5506901ff933419d43b4b00777a9df897d6fc702ca0d5b9c38c2fe0d3c337ad8. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/SE6SA2168403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc978368ae70c54026d7f989199219da7e5e345e9db6b4648a19dbe7754aa87. 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/SE6SA2168404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ff2936bfc32cde406a327e71422406ba56852ae02a1eb94ed9ed01d1913dff. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QT3F22465964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9aa3982fb14608a687a2680072bc9c457f2b62ddf0125f4a48af65aaed395d6. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZDA82508443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31342d98a9f982bc1fcb97cc52b58277b466d5ff8dbe0861f8a432b5b2bcf58. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZDA82508444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e9d6342a3aa1423e8b6704dcb1503a20c109e737233d2b14d66e862c0a3e2a. Chain 2 (Bitcoin): anchored in block 957540 (2026-07-11T08:19:50Z), 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/QZDA82508445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0123393c564c919f57d8ed197e68bfa98f3fde5c4474ee2c6437a88f034ff3. 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/QZFYX2579786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ff2936bfc32cde406a327e71422406ba56852ae02a1eb94ed9ed01d1913dff. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QT3F22465964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c0b0873fc922ea3cd7bce792e57406b442e8eaeaed2a2de1c3e239d6c4e26a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZDA82508446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c341bf3aa8b26e9e95580019fb34318177b1dac06b74ab0612acc91a1d719c2. 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/QZDA72508652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16abbf34ed9e4c59da618eb74292fc63679f16f0322d0ddfc0f402f74b88eaf. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZDA82508447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95dc45b22258f5abeea973c2061cfb2fa6e7aee0f7f78327e03ebb1325926794. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWW2550388.