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 0x9117b19ec72bd9d51c648d6297dfe05ceaefae185e0976d4924715f2ceaa6a4d. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c426dd4-c556-41ba-8c9f-f886e53760fd.json and https://artists.proofprofile.net/proofs/artist/1c426dd4-c556-41ba-8c9f-f886e53760fd.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 0x54b9c40adb8b6fdc5db82b8828cd20d40111b9a044ab0269438edb10fcf5ca87. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/CZB871505001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6439b3c4ff5b98c6ad9f9e85113948df91a64ec132ca05d623b795eb7e419cc7. 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/CZB871505002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff0dc9204509bb3994bbc3eb474fd9666dfe3367cdbb34a7065c2fcd4648034. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/CZB871505003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8639011d4144b77669a8ac135a56ff9ab5d1c6f0eeb2d6606d2239bfa397b822. 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/CZB871505004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbbd2eeb2ae3729b0fe8a3ed246b37b27d9e05548abd5c681425bae5a4c43555. 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/CZB871505005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81f7b998244b882d86dce60c6b335e6898408cb5c9b498003b7b72b5f66894e. 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/CZB871505006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb0518b04ef05ec1924f9e986bcbc179692cbbcdae28df58b9ff56f17191637. 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/CZB871505007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c9342bfcee77bd5feecc7356d8d1f21be165e64392989778bcb29acaf6c010. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CZB871505008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4411cb3d57b7075d57ebf6df974189b09dcbfcf92ed9d8ece623879d7750fa41. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CZB871505009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86016fdc86e2e55f210177d8049d6fc3285d143a6bb068329501e4dfc5ae7658. 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/CZB871505010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6750185001fcca4a7901e8efd79a2c80c93164585e80ba2fde986e42b378bf7c. 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/CZB871505011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e49755a445e949bc4bd1c2fdfba6c61410858cdf974e159a18e00ce791b860. 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/CZB871505012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e352b213c722ebecf6af3524f81775fce27c298af06ac67739a1fae536d55a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CZB871505013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4c0e7cafb921b1056b2bbd161138e84952ece4cf375aa9fb2ba8ea1d127e75. 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/CZB871505014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d8a0ff8a27a30b23d4281dc2f258e5201b2a4ce600fca5be7d0213a61edf6b. 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/CZB871505015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabdeda43897d5e514c8b4e6ad73765af8902c3a8a61bbe1fd1afe0e1366ee852. 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/CZB871505016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2a53913c2555f71a0fe44768cee6eb8219fd8c95770186a9a360d644a69fb4. 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/CZB871505017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb296839ffb2f45174660c18436ac9ab368253a962114e743849cfd776797031e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CZB871505018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2731f4967caa6279cf2f87ec4200cf33ae20859e650a353bfa2b50199c300ca2. 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/CZB871505019.