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 0x275771f497c6b49ad8a63feccf0d85b7e2dfe0e9198585fd5b8faf7e9f3f277d. Chain 2 (Bitcoin): anchored in block 953782 (2026-06-15T12:13:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5958350-f4c7-4e78-901c-d3353165923b.json and https://artists.proofprofile.net/proofs/artist/d5958350-f4c7-4e78-901c-d3353165923b.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 0x365dd4489fbb370b55224eedd582f0ff42471c027a9e0bb0a9c793660d4cdbd2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAGG2252712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd734ca4f64c75995bf86b4d2ceca58476f3e0876a55646eec4d69d5d855bb2. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/TCAGG2252717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935d13e2ce5989fcc1c8adc9f4b941def89255bef15200febabf67fb782fa05a. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCAGG2252721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28bc1e2357f9f0261067b1706367b38ac9790e9ff31e320f920e1311da67c008. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/TCAGG2252724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4122a7b5cceeb371078f34a094bf7260740ce9ac1e1ece46ecc70841b507c999. 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/TCAHM2348087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad85924dd3a0c33d1bf7db365f5585b1f7edaecc2ad9ade50bbf5f23df60a220. 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/TCAHM2348090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0463cb04b1978e2e480e482400b2c772d95603945b10f9243f5d1ddf1dc230a. 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/TCAHM2348094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922b738d5153c4bce1468ce8dc68e10b710ab8808b644647e43a6394e41cc7dd. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/TCAHM2348098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984504dc64a877223d56b57811823662f40f3af8f303804376285d808b9378a4. 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/TCAHM2348101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5478853d7348bf7ce30d1117f5082f45d4eb975a543dd2e9917221f4cc7addfd. 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/TCAHM2348105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730e3f5a2de11990102f894dadb77ecf3c3a4b71024d9cddff605a8f5c4b82a0. 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/TCAHM2348106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a8a64c6ebe62615f1b035677b08ddb45766956a0c8d10f6de9b75bc109d02b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCAHM2348110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e12d74c559ca05ad608e02f990f763452d4269a400b0edfa60a4ffd9747cfcf. 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/TCAHM2348111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e87f5213a1d461896769e0ed4e38fda22bb899e335d70bfe32c0e80348cad0. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAHM2348114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde860b8f0f0c2b834ca50526ed20d257f3dc0d2aa04e6deb5fe8b92a3cb1f938. 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/TCAHM2348118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e18e383ffd619d15106f0a6e9785657dfb9e1ec4baf9980a2e07025297b998. 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/TCAHM2348120.