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 0xd4103c744889a97b752801470a28e658dfa3c54e6e06c6caf0bc489d4cbd7388. 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/4f2183f9-d857-455f-bcc7-df8827731bca.json and https://artists.proofprofile.net/proofs/artist/4f2183f9-d857-455f-bcc7-df8827731bca.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 0xd2865b12cdf5a8c387fb5542bbed4f120bfaa8bfe660af132f461553da9185de. 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/NLG180500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86302669cf65ffa2267cef75fc1ea37b5b20d40acd5757f885acef86bc60a380. 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/NLG180500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96dabf7f2ccb3f4fdbfb8cc5c9ac608ffe43cb3a47d7a8814edb06ac4e1131ed. 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/NLG660900124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23a3e07537a237bb37568a643b9031f18433e47ac021b363d60bbaea2dcc6aa. 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/NLG660900125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1398558aa4de76e26e40745bf2208e36d4e5330d6efe8803cdd445accdd7b8. 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/NLG660900126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5954c5219fda273c8540fbd6f22734482984bd29d8cc693a4241ed3ca1daec08. 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/NLG660900127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafb1745f74d5ef0f1256cbb4fdebe2092896ded672209b46f6cfe3f64bf71e7. 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/NLG660900128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd073d8c0de19ee9ec57717f5d1d884c9fef615238d702aeba98eb0bffd12cbee. 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/NLG660900129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd079764ffca34164da58c8c681f20ba1224c02fad4250e683c0d66c246032858. 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/NLG660900130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd20bb0c53a5b8cc190e698b192b58b8012175b83abeab4039a17b114349bf2b. 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/NLG660900131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e6e50287639f8acfbdb99baee21697432ba9990c4a84a123e60e1b24718ac6. 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/NLG660900132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae7a3bfece4b18e643371808633fec0b16d5161962758fc3bca9fd3ea800cbd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLG660900133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75927be63b0b1e0e1189a0054bba5800dffb7dd3eef64bc7e0ec45450d878aeb. 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/NLG660900134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56f7365a535a1c88b48279aa49ac1ebf5e3999d9d5fbcd9692b36b74a73a6fc. 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/NLG660900137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091232ed59f56eb90b209381792c7c7a8b8929342501ae2538023a107844d76b. 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/NLG660900138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82f593c054034cc9f13448ac0bcf3fc86fe18ddf5cf8d8ea117d8896c1fc882. 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/NLG180400004.