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 0xa776df4c83616d65dd5326005e93a880677d06be3fa71b71b6be98623b8fd0f6. 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/ad30710f-1120-4d3b-b434-d10275ef7813.json and https://artists.proofprofile.net/proofs/artist/ad30710f-1120-4d3b-b434-d10275ef7813.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 0x2322b36c51376cc2fa31926e7f0a540a6b544259e190104597d8012891a28d13. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM6P42332398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152f184639faed63e2e2ea38cc81b93fe12422b69784b99ae2ad63aad5b7e556. 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/QM6P42140559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb45bf36a9256482d8c99bc77236984622fe4c00e0146e8d89bf211238d4f299. 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/QMFME2118724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008b8510414282c4eeb0fa0d81dc45be2e71f8605ee4335780189edd78708f9c. 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/QMDA72191774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af5fee2241411342d7651bfc4e08fbbd8b205608182826cf082ecae25956dcf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QM6N22249222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008b8510414282c4eeb0fa0d81dc45be2e71f8605ee4335780189edd78708f9c. 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/QMDA72191774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb45bf36a9256482d8c99bc77236984622fe4c00e0146e8d89bf211238d4f299. 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/QMFME2118724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152f184639faed63e2e2ea38cc81b93fe12422b69784b99ae2ad63aad5b7e556. 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/QM6P42140559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a05472bbd7f5f074ed2dfaf3e99436169fd40d5dc77ae45324e5e0c799ea543. 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/ES5102200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b60e9fae277abca776f795e1862cf4db87ceae8e2dfa429953134b0603d723. 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/GX53U2042666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9e59d9e8cb751acf6b170f3d4448fa4dd224cc85ecba2812709e3bf219c7d2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBLFP2045223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3a0626e797d70c073ce027084d46bf022d1a7611fc2d8b148ecb709f6eed85. 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/ES71G2113141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3a0626e797d70c073ce027084d46bf022d1a7611fc2d8b148ecb709f6eed85. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/ES71G2113141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2322b36c51376cc2fa31926e7f0a540a6b544259e190104597d8012891a28d13. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QM6P42332398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974f777cfcaaa481c8ad82fd44ab6b845a63e14d9ccfd6cc8da0abb38512be56. 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/UKXN21906387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d6af786651c93cc5e2a82ed4a7f9d6c5f9f6b1f70a261767d37c02dfc90e0e. 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/UKXN22082341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3cd48fc2c16b2355ea7fcb4f17f7ac76e6e198d5b2558494aa250b60ebfa40. 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/ES71G2107997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e32ca942562dabd4ec2c1fd0a499db6a4955651ac21876d4f942ea9574f201. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/BK4DA2202565.