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 0x703fd3b9744a5cc7bd598e7b45c6a1635e684b32a703290eb8e9f8e82edec692. 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/6de441a5-63c4-4af8-9eaf-828e6b78d063.json and https://artists.proofprofile.net/proofs/artist/6de441a5-63c4-4af8-9eaf-828e6b78d063.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 0x84e41393cdd07d43fc55b82fcd54e06c4fdfbfe5b88e85cac7b95a43b68eb304. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/IEWGI2359419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18f54e172952b04dbc1c3b81c37dd542b735388ae7b433c987db17af3e98431. 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/IEWGI2394198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2952e7d96230467cfa2c16da0c9cb18fac241d1fb13f308df8d7d2d378861b6a. 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/IEWGI2341930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ded504de64a1688ceb6b6df33a025d2c515a9bfc5f4892455a5b3910480742. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/IEWGI4190747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec2c899a21ef0c4074a83c2a4eddb065666a477a35f2b6ede4abc7b8c5d9eb1. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/IEWGI2340498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeabc84dcbd69829905f3f8eed2d6e53a341fc4492f0dce7664bc5aaadd0c607d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/IEWNY2302341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c53e5f8e5a5530f1da6172ae96c1d38d1f3a521b2a29b03662e31beb4f03bc. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZFZ42446734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1749d03cdfe43f85413d4cec04847817ba115ff40257eb00210f701990bd7cd. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QT3EY2492034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74242ea169cc8deb4417c4a49431850693c68beaa62f4c12b528cc4281772bc3. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/QZZ7V2457772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56ad86162662a38308012a72ebf71face76539e480e3ab84dbabdf586060c9e. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QT3EZ2417301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e747b163065694a0548528afd1128d9172c6537c689326946a6a6c994df2c1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QT3F22401057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f8f14651c603e3481aab36cf229614edf6dce99b162f6f1eafe8a82c1c08c8. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT3EZ2463662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02bb3cb6f4b82b9f127a942af4f6906b6644210aa109baee41d191f209312400. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT3EZ2494028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a258fa59eae7ed43c62a6c9af39c0cc03816bf737c54848d30805d1101ba79. 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/QT3F22411153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620b923a1e4bd725d7853afccc4dbdf32ba2daeb3533e2eb2da6eb070faa2301. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/QZHNA2572768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5822cea524aced23786549e973019e0f02ec6aa4ba7906f6d1e64d3ceede1989. 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/QZTBB2588437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0dde792b13a76330ae3564716313c70cbc4ee748c903530df5b83725debf7d4. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZWFR2579475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe009566aee5eb26313d666e67a4dba9fb763efe92657294c062f85b0d195ed51. 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/QZZ7W2582546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a68487ff2022cf9131f7cc7fe0a07f077b93e6e65eaa7066c754215de11090. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QT3F52587566.