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 0xb39b0d5f056d803218713b966b4b940804fb4a1692fd0eb78deb72e34ec24345. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6167f34c-472b-49a6-a63e-832525891588.json and https://artists.proofprofile.net/proofs/artist/6167f34c-472b-49a6-a63e-832525891588.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
二十世纪中华歌坛名人百集珍藏版—才旦卓玛（三）
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 0xb4c0c9ddf2ad9c6f713b7561a7e49ef68437f1bccf8a373e12852483e6ea91a1. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/ESA012360473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2c20fb800557e341f1e97ebbcf11060e44a7ffc6a7bd7dde601291eec05132. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/ESA012360475.
二十世纪中华歌坛名人百集珍藏版—才旦卓玛（一）
二十世纪中华歌坛名人百集珍藏版—才旦卓玛（二）
二十世纪中华歌坛名人百集珍藏版—才旦卓玛 (一)
唱支山歌给党听全世界无产者联合起来
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463b2dba7e1e042799666bb26b614b6dd36329f4d36f0ab860a9aa38fc0f2afe. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ESA012361060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9cafe26b87963792224a24525e886b6102479ed8738f311e8aa2302cc26247. 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/DGA0L2384753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8228f53611de563a0a861034fc0b06c5dc3535b9e79f8e2906736ddea5257e19. 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/DGA0L2307927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f3bceaec727477a70b9d9766cd299541ac7abfbf656f5741143748341cb6af. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DGA0L2384846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c77b3ff9d9ce5bc52c2a429f2a0bb285917031ec1d8ac1a75e8dee6d3aa038c. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DGA0L2384850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4043f9c36727709c51ca25440684f5ac249b3ce27d95123206ad552c8de202. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/DGA0L2384851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf077264b6ede34cb7d7ba8c7286518420064d276b343da5a330a4c22ca2fdc. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ESA012360865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93070438cd9ff199aa63cc01643979191aa9dec3a9578da3ee9aefd8a76b726c. 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/FRX202278341.