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 0x2b7ac2ce89ab28afd86e00b7740e81bf9319e4c9a5a4da38649a87e2dc26cc20. 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/3d97eda3-1ef8-4010-8327-92c91edaef80.json and https://artists.proofprofile.net/proofs/artist/3d97eda3-1ef8-4010-8327-92c91edaef80.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 0x28c409114b2e5c54c9410071feec0fae8c0b91ebf758852281b663a1768d2bed. 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/ZAC012301123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364b78051f41bf25909a3033cf59092eeac6ee8aeaad4c8939f4373d799db132. 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/ZAC012301124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122f02e932847c163bfa362265a5e7925e5657f8fe21b5a04348c6fa3e6dd0e5. 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/ZAC012301121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8cb75e17a851154e628e77b98bb5a680754568c4b32ccee1e0b8590fa90dec. 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/ZAC012301122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c409114b2e5c54c9410071feec0fae8c0b91ebf758852281b663a1768d2bed. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ZAC012301123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f9263c1fa2ebd41982745643bd09c4a777bb2bc41cbeff83cb039d3c973de4. 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/ZAC012301125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd935b98bdf1f3626d85511c49ff8574c9c83f1578a842268d8e04cf29c329aa0. 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/ZAC012300858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525dd8266a3c2634b485bae6ce39d17362b1a9d659d0021b64a9658080104538. 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/ZAC012301127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e232a0d1f04daafb76e371310d84b2977e432872d2474c13a4345130839e06d. 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/ZAC012301128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd8e6348f6497bc67c4150fb3fe7562f3e6704c7c72b5ed3c2c5df969667055. 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/ZAC012301131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73a9b0e7982c5e6ce23d5de0df131c2959c8a570f5525df1820adc3b39f58ba. 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/ZAC012301132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2eea097d38fcc8fc61c07b8db6bf77222332b4bfcb8dbe4ef48455b33c8c466. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ZAC012301133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f263f71ce16812da666072eafcda838d1af6f89eb258eaf9a87ec41c9462916. 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/ZAC012301134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52774b9a2a382aceab4449a7e9b994f1bfe1b395d868fceb0f74229f556f414e. 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/ZAC012301141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9213e4f0dced9c36c179c39934de271d2bee47e24045ab51e9d65ed09acbaf. 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/ZAC012301142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b676707d2baf0a4ff21cd036c1c4517e5f99cfede98f483e3b7ed4ac5ac78fb. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:26:02Z), 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/ZAC012301144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db101d8cfc634d3d4665b03500632a748109b04e4eb0c1b530200ecb4242f5a. 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/ZAC012301146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74be956ae0baa420bfb3277a6eca32acfd95df53f7016ccf98b1f0a7d79912de. 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/ZAC012301147.