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 0xe64cb20804c51397dffd217245fff4b3d0eaf808f44acb8f718d363a46b3a597. 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/90de07d0-1fad-404f-bc9f-8bf680641ad8.json and https://artists.proofprofile.net/proofs/artist/90de07d0-1fad-404f-bc9f-8bf680641ad8.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 0xc1d342246dd03669619ebcf459f0a1cfd89d2eaf60fa0c3a42906ea6ec1c9293. 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/USCRB2400057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c34ff51d7d6c6b9fa9c13f27e93f8d0340a10de0e556d060da761c335f11030. 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/USCRB2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada6542de46c034e84855ca507d912ca142b077747a8c21761d778ef36d0bd1e. 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/USCRB2300310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190774a0a8a50b6114d6a53a15c625ac51a32c4814604cec1d01f3cd367f9d2d. 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/TCADR1885083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac53ddb2dab3ed798f50c692542576713bb621bcc5a556c3418370f26673896. 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/QM24S2204001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866fa35ee1b74cda936cfaaa22e109c3768fa341acafd707b00eaed256a13873. 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/QM24S2204002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a890d174c4e8b75682e8c9fb3c640629869ba2fb7d167f75370085c13f3dc6a. 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/QM24S2204003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d805a968f77611e8d26eefb4cdf53f0ccb214e02e1a5e5b7f9cab518b976af4. 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/QM24S2204004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4abfce148699dcc94837f948c16234a0deb4c45fa2383d8a785d6efc0c6e5ca. 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/QM24S2204005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe70bafad0a7a770481afd3725b11bad65f9bdb8db65cdb3fb1c51612700bc8. 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/QM24S2204006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd4edd44f1f28c051c3184cbeeacc8babd9382a0c70e98bdf48c3b62aad6e6d. 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/QM24S2204007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246ea1bc223de0b1de5c3b489e512a8008c44fb35f291be51ad0ef24c634e6b0. 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/QM24S2204008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60f02d81ac5d0a81b0cfd78c263dedebc422854d8d0b4b94fc7da3601a35e0c. 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/QM24S2204009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7df23630f93bf82ee36adbf68a0f1c154d187aeed08b408fe91a6436d680d99. 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/QM24S2201579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c5edd1a4af3a1033c93f25466e8fce981418fbdf2730e6a87a4045a0311060. 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/QM24S2204010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628429f239e3ffceac0b469aaa4d943463d0db726c62d84529a11369ae3c4f23. 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/USCRB2400420.