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 0x8a93caa0e32cdabfa783026d07bc694651610b9eeb6fd569ddba4aa9fa887419. 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/fb058805-7162-4e2b-873b-8909260c024b.json and https://artists.proofprofile.net/proofs/artist/fb058805-7162-4e2b-873b-8909260c024b.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 0x78c63db809329f91b224ce68b2f0027caeb274e964616d7105398a1dc7034f83. 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/NLQ8D2101223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc412d86a24e9c4c2515f516b32688b0658724760bb5413f65194e715fbd29790. 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/NLQ8D2101237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x458a68adcea0d14a6c341e8a2be9329191bc46a024f66da79661ef479ff2aae4. 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/NLQ8D2200925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374bcee3c8633621a9ed0aa84e821b0e8232e22a60eeaf7f8c605132b494e3f6. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NL9KQ2390301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51aaffa37eb06af579d554d0479e1fb838647b2b85c4ab5b81437a2619162f3. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BEIW12300097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d57bcda8f333cc9ed7204fe150010b61719afc748ccada7eb30396777d9b3e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLQ8D2101493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24597c5546031d1ae84dc45a4264ed4b49c156a5558bd61dee117fe6aba61f23. 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/NLQ8D2100833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7d409de7ecd91fb4a979a573759ac967c2dac00250485ef861898b2dd91436. 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/NLD682301407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc2b89ae28e5711f692ec242aaa1c58520559d1fb1afbfcdc54d6a118dbf28e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLD682103639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09fd3d8784e7912d70c5fd739359c710b004fcdb48e5e2cf96ce42c475c0ba84. 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/NLQ8D1700321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de4bbc51475f191bcf7faf17da824ba8d0c3d16e1c04efd4e4bca215d22ca62. 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/GX8LD2316604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1c1fcf33661da1e1f2d9644a7662cb4d974c63cb76a9a03ad51883325c8d0f. 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/USA2P2026566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee0ef5bd7269fa2650743743efac4a1ca69275a396141f77108e02da3a1679b. 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/NLQ8D2400255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee0ef5bd7269fa2650743743efac4a1ca69275a396141f77108e02da3a1679b. 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/NLQ8D2400255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a98b95df5be40c0d3a4ba508b9d2461e5458fe8db9969345302b8ec07475dd. 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/ATEK02277079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd50a8bcd098875f9208d1f6ae50a7ab1e85cef6f3f96923dba331c73900d42. 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/NLQ8D2300435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450a302f752e497fdba3f1d169f7ba0d1402f9d4463f9ec36da3501f43f1effd. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLQ8D2300434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcf6cc1cd709c163b992c8f6df388f1d9c84ac212031f36f7c3e9db60082ff1. 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/QZFZ32415759.