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 0x71f1788291f9a54cde884a4551f4020b5c8a3e22917f6980a25c12bf5f960061. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bbe3feb-201b-497f-8ae6-b2df75a0cee7.json and https://artists.proofprofile.net/proofs/artist/1bbe3feb-201b-497f-8ae6-b2df75a0cee7.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 0x1a1ad29d406160edac7670346f64d8383455bc5913b4062330e747d6676191b0. 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/CASD11300595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e08c07da70c4864ce75517a7037378d5bbee9cd75a348d82f027eb7ca4ff945. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/CASD11300603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bfe2141f26d9e8d4ace2e966ccceef70bb1af4bf1d76fd0f7524108ffe03c1. 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/CASD11300596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6db8360dd9d9900277dda23cf1e6d5cb973c96ab92c86a30aef64b5163e828b. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/CASD11300604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc019d7f346dd71a04fe0cea336bb9b307ffd5a3ae3215140be20719cca1ab192. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CASD11300597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf24a6d3cc58092e6d67b930557169b15050dde49f2d72ad9dae826eed81ba78. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/CASD11300605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fecaf91e89a503ba34fb16af84f63514f689a6854d3c537f2b5c1be61d330b6. 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/CASD11300598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04db0f1f37a5fde1eb3a78120d76da7d70b924a2f118044ea37c141cf01bf969. 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/CASD11300606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed38b1916577802348f120adf34a37f85ed2560804c98980f7d266d4a207499c. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/CASD11300599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0caf928d25880567dbda752ba17d2b1246e76eb26cc1f9ed6a69272c3f9020e9. 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/CASD11300607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d1d156842ae83b39e2901153fb1fd1bfabc7c90e09a77cc77bb67b609bb418. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/CASD11300600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93e6672cd26fe3fb88d715e5b56136474471745e9e9d6860d2eadef4042a9f0. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/CASD11300608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92556bfaf6822f4a80ff5b64215627cdbbbaec325807c3050d3a6074f1d24b3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CASD11300601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6aa53b400f3a53d5e562cc6ca81ba3cc5eb3057b738f0fbc4f9e51e3a6b8c6b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CASD11300602.
莫札特: 第23號鋼琴協奏曲第二樂章: 慢板
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59aa6cb4cdb570aebbcb25318dacc41cbb8b5198b12b94dba36b32c1a24a0dee. 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/NOAV61702761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9c7335dfc81285bda2cd187d934caa7bb09804fc178bede1f272261ab0d125. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/CASD11300229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40b47ddce80930e6ca15953ab2a4d4c9b599775e9ebb4e8194bc1165e48ada8. 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/CASD11300230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5e7875d81e215521e67e57e969efcf1ab6b7dc837afaff88ca9da02f0621d6. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CASD11300231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2e2395a795932eb3c7cee2e291a85aee425b02291e35d0b416622b67fe5231. 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/CASD11300232.