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 0xbb74c64eb21cb70ee3fabdce07ede694f719891641366643f1e0a1af91ae5606. 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/8a3758a1-5550-4a1c-8761-78c48bf5915a.json and https://artists.proofprofile.net/proofs/artist/8a3758a1-5550-4a1c-8761-78c48bf5915a.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 0x54c93edc3402e1d0d95b417c409f32cde5df7f0d51eb9eb9ab89de15989c8c42. 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/GBCKG0700759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322de65306ee3f0a7ffef3d676b2bd8e03094aba25dc039f9ed62fcc7dbe8f95. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBCKG0701891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781e24566d86a68e27cac34430f33830f7a4de70f7d6bdac23bf0b5d72fcf8d2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBCKG0701908.
Purple Bamboo Melody: Zi Zhu diao (Purple Bamboo Melody)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ac02df5d0e1214b37b48d000bf015a61ea43e1db42878d0580c2f40d9c8461. 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/GBCKG0502406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5c6d04ccc0173a4fb15fff3c41dfeaddfe1ee6c332387023ac2b9089dd1ccc. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBCKG0500426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8c26c2ed5313ae3db2c91f8d16785ced2ec1e1390e42b715b8b9b35e50b1b4. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/GBCKG0500980.
Ping hu qiu yue (Still lake under the Autumn Moon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7e3a180e6ae0c16ef3c457c3cfc83f9593b590a9ddd7bdeb8ce520bde5cbbb. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBCKG0500428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2fb0b8ba92cc674c8a96cc8b9731cee3b2e960744f67beb813ba8879edff7b6. 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/GBCKG0502407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd969aa81d39f1c1323a1fe6daef4a56aa57dbce505b0ef5fae814a5a1261b4a4. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBCKG0500984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd443fee95ac621c6f69fdb9084d556b73a2bfd6be2aa528b51c08ac5a32393a0. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/GBCKG0500981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6b93b35370e00325e8a1499905ff75bb2659afb9f26657564ef3ae207817b7. 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/GBCKG0502412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad152c968ec4fb892d5f9fc43bc705539c70e06c56368d3cf4377d5fa5501bb. 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/GBCKG0502408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad312921757e72377afc65deb504dcb4aac10d30244e378b3a7f13c07096d63d. 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/GBCKG0500990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d3c2de544768f45420de87b3d9fa8fddce4406e0781a5efaff0f12d19205ab. 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/GBCKG0500427.
E ma yao ling (Hungry Horses ringing Bells)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf151fe42c33db387d113f5e6de14fcacbb9e7da7a688c3d2aacedc7f931fb8fb. 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/GBCKG0502413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8050854c64fd13c250c5579d8f0ea71cedc393a7441b354a915f92d50682684. 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/GBCKG0502409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb433b8b0e6169e251997f7d269fb77837417b7d83877ab9b58c75ab61735104c. 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/GBCKG0500985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc9ecbfabc46ce692abd6e18906e542070b96dfde3224d8437e99859c89369d. 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/GBCKG0500982.
Han gong qiu yue (Autumn Moon at the Han Palace)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bdc087ecec50d8753c4266840f2a8d35b48326390ba1688ddbedc5b902f545. 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/GBCKG0502414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a27debd987163eedb20c5548a7725ea4adaf866827b73c5f176fa1eb271cd0f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBCKG0502410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36136bad8106bbb5637a3dff63215f6eec3ad1716b590e64328f76ebbe609c29. 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/GBCKG0500991.
Chun dou xiang jiang (Spring comes to Xiang River)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ed40393173461072da4f3922cc8265bf07aedbcd611db34d4c12f5cb6e8839. 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/GBCKG0500983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a61bb32a85ea3b4414c8ff478127e6aae4934121e18d2864daf948c5151134. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/GBCKG0500986.
Er Quan Ying Yue (Spring Water reflects the Moon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0e243e7a17e7c5b4f542cdeb318a399bae22fa46fdc2159e4d55bec4290c29. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/GBCKG0500396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25484fdf0e21a0ff387500490dfb9987851606259d4ed8919961c789762426ad. 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/GBCKG0502415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1b8290594f865927aabadb57135b62506513ca2b47a7340d5a7a2020e4d451. 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/GBCKG0500395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f529ced379cf2eaf2916e1c8b17b221f2be140187e665cf3fcec6603acaa53. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBCKG0502411.