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 0x535daff108eb2aa4740e125237e8b77fe2427dc954e81b4a8e6a4c297bf27bb7. 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/155015c0-f780-4056-9e3a-b7fd78208c16.json and https://artists.proofprofile.net/proofs/artist/155015c0-f780-4056-9e3a-b7fd78208c16.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 0x17299ba776976264ddce088f70a68aa6f294f4c40f82ad0d62f1d7140c342ccc. 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/TWAE32401931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd5e9db6f3015e32eafc2693b1e53eb53838c97c02703f889633fae3fffff46. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TWAE32401077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfacfdc06ac29efdfed248e9044e0b75569693a6e246666b9c8cf42db0f713b0b. 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/TWAE32401661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1873b0843f87c0fc4603eb53708be5121e9afad1115c6d523876572c4e834ec0. 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/TWAE32401414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49541bcb09fb4fa95f90e154687de24e173fb6867e98fdd713dbe70e2d4b8cb5. 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/TWAE32401933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae958c5260f0cc87f10767b6aa35ee1ae4a703ac36cc9a1829da9ab72b3c11f0. 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/TWAE32401935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3563407e4a0642076994291a0f0d0b7b7861129147da59b12ce0d48f83c64d. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/TWAE32401936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3de7282b91a6d5a4a648e4332ea98a74004a70a1c698fda3f7146a6fb3ed766. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/TWJ012101001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb8b8d95ecee81bca5dce79ae77f7485712f8f1b356b2c559d3a587ea790544. 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/TWHZ72000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee60e7272b48a2d422a134d38dea556ab38431c6df0969b461527ed0b0f73ae1. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZS672297091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c32d2c53efb538516fcd5a81c6bea144ec74d7063451bf5aae68dd350de2d8. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/TWCC32304142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5ef56f7fa5a0098d6a2b08e1e6b4f493bcc7ae9cd99bdc550c1c829b923aca. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TWA532101221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5e8be83f5f344098b06475e101aae5fd7a56ed8b68e992a47cfe3c6faa9da2. 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/TWCC32319188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c32d2c53efb538516fcd5a81c6bea144ec74d7063451bf5aae68dd350de2d8. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/TWCC32304142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ae8f5e63853116bfa27d61c3f7df8b404d93f1af319c6dffaf4aed7ba1afe2. 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/TWCC32319192.