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 0xa283df4ad01c8d8aa9c20ce4ca6d17d3fe3a46f0c187eadab45f189e2a3096fc. 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/58866015-224e-4fa9-b968-79dfa2cfd0e2.json and https://artists.proofprofile.net/proofs/artist/58866015-224e-4fa9-b968-79dfa2cfd0e2.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 0xd5f6307867f11b71cfa4cc3281d13091860f1d1e3082b81624b693cd193c994a. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/CYA221400088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d2049dbd5b8a65bd9b2bcbf63acbc1852e1c668cad8d42be09d532b96408e1f. 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/QZES51800613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6492297bad6fb7d23a77a01affebe1afab61db12aa49684862cbc8d8022b885d. 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/QZES71856448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb44975fff7f1b1d3dca47617a94b0cea35fb8e36fe3b7656204a1a55fa357ae. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T15:36:33Z), 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/QZK6K2003859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa217b61f0888f09093fc1a41cf3e07eb07cd204744640169b6da34164b120836. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMFME2096756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2c0ea3e0e4aaa8004c54e535b9293f4e50b1945f3fd42f2f87afaf803f2d1c. 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/QMFMF2024881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb136b0dfca6ac33f058552e91d52f5717169ee536c543161e31d046c64145d6d. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QMFME2199536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e237780ab751d4ace0623804c927c90fbc4bb19ee3fafde50835601b8a21f45. 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/NLAM42100110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976b91ce28dc25fe237bbc56ccc59cf503fa1d5fad8f4ffd16bdf81c10fe6bad. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:56:19Z), 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/QM4TX2168653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c9cf0f3bc0b1b9fbbed2e8e11f3616de9eece53edab1f5f9737efb09c6560a. 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/TCAEL1912503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae68eba0fe81f30a440e33969e6dc930169507ea26128a9dc5706215c0dc6a6. 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/QZDA81983796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5672edec4e3cd78480a8f353cf3541796c24489f5187a91c53051e3b4d29fb4. 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/TCAEL1912572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5de582e5c85f3f41d2dbf769c5a219aca3457b491dcd7fdc29996fefa895bc8. 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/TCAEL1912580.