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 0xc046e394b4945a0a60b3c1b159151968c4694c5aab73668207bc61932b4524c2. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd1b44eb-2515-4595-bebd-55dbb463134a.json and https://artists.proofprofile.net/proofs/artist/bd1b44eb-2515-4595-bebd-55dbb463134a.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 0x775655ee099e7cecbc6898082c3663f274c7c58533f82b3fe159fac37d73089c. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZTAW2499080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28cbcccefff58a998d059e69920850624cdda4b3c48af79bc8959e5d2cca3724. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZMEN2599323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe346903c2a3e97c3d5cbbcc6350a9549ce64ef249f72b828761d4f001e8ffa. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZMEN2599324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf139b2f6011174a26b827f49ff7017c5cfa625bc8500f965efabe7ec16d303d. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZMEN2599325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4409fb18bf9625e1a31913f2e491a99fbda3ba14c03d06c54a6d511a5325aa. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZMEN2599326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5678d9f144e55610658dc96472335106d2b4bbf4c4299584e1128b597c654f. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZMEN2599327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c01b2ff5c8ddf60a3509559886c276847d410e7fcb557989988fffb87e50923. 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/QZMEN2599329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82f4a0ccf17643aada11d90f5a3b7847eef04fc4bd49a9d1b5756112618129b. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/QZMEN2599330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2086bcf20ce673bde8e6b5dc6ef38aa51cb4168000311f3fda4df8a7d570e40. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZHN42520368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0d3db476bdd245c18ea6b963374e1360883f589dc5628be278f15d3ad9bc0e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT3EZ2477374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7db2547d4c6ce4612d5096d61a10032aeb8e277584d37a2273b5918403336c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZWFK2588772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc4c60588d87bd42d6020a17f6349d34e13f5daf417c56f8e8a6c17e241c802. 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/QZWFK2588773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cb9c75382de74378dadf3009d2003f7c3817c1f1ec703fb064e1156efaa7a8. 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/QZWFK2588774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4deb4afd1bd0ce11dc4a3e4a6d537069e0355cc6c2520b63bf3021f0197be585. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFK2588775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6fbc59163fcfb2f4b66e914ba9daa6bfb73e52e1d87d5872389b60e54a58db7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFK2588776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61c8135951034f03d9a2cdfd7a3695076993ae455a23b904422a558e3caf4db. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZWFK2588777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7144bb5fef92ed9b9259e48cdee6e76dd1a2eafe02ac5b6dd31e8db349ae3bfc. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZWFK2588778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34115e5f8f78eb5ec7d80a945a00925d31d102507f2127736f16f3c039db804. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZWFK2588779.