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 0x35a4596339a1c1ad2672532c2b170bc6e6645a1c300abe225d03b069b2a55327. 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/75559448-abfc-4bbf-b8e2-b623baba85b2.json and https://artists.proofprofile.net/proofs/artist/75559448-abfc-4bbf-b8e2-b623baba85b2.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 0xe0c19ee968da5b95dc246b28596066f652fa9106ad0612f5fc922b6e0a9aa6fc. 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/INO132101457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a2af23fc6d1131a7fa15fa30509a422350319b80b39e2be5cb24416c03be96. 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/INO132102181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e68523368f2371495eb41a4e4c9f956ec55143f4053cdf1938f0dc7dc2c070. 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/INO132102289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374f7416d11b3408b820a97a2a6559bc8c080846de2dd2c90daa5003d873e6c5. 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/INO132101387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de071afa73a2532a675e78182dccedfcd434826672ef8f94ac1618238b33bfd. 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/INO132101461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603ac604e411caf570103ea19e528575f4650edad3e5e958e3e153dceaea99ce. 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/INO132101462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec322831363f104297f0a3362955401b4227f7f77abbbacfe3d7f4e6dbae93ac. 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/INO132101463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1f57b077197f9ae54154f3c56ed7ba51fb125359c5690660f8389aa41e9e0b. 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/INUM72400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1e4e690e3b4fcb40cec3c7844d6d343ecd07e8f95674171a559934ddec94c5. 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/INUM72303050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341d3b22918813129441f160e7a1379cad2961f96544fc2fb01a2c109fa9d0c4. 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/QM6P42373590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374f7416d11b3408b820a97a2a6559bc8c080846de2dd2c90daa5003d873e6c5. 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/INO132101387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e68523368f2371495eb41a4e4c9f956ec55143f4053cdf1938f0dc7dc2c070. 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/INO132102289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a2af23fc6d1131a7fa15fa30509a422350319b80b39e2be5cb24416c03be96. 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/INO132102181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23faf91385c46eade4ef1ee2108440d352f7e6c43d1e0e72e899eaea27520af8. 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/INO132100551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbbd91e5d2fb4b00bde65a59931750dbe4511b1ebe694fd11c92346d43871a3. 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/INO132100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0af3cd2d9baf017b25a53711d42043957996d099310d83847fc6f1aad3e06b7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/INO132001822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42907d3b09427f3407ba4c47fefd2458bc1db50c00b82d7cbbd00bf2c0267cc8. 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/INO132001390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ab93532b8ea6d96b8441fc1df52652cebd3f21c04e18f7e8914c661b046909. 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/INO132000495.