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 0x451d1e902354d387889084b940302d91c1c294be524be9f062f622411a30f9a5. 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/7689a2b2-d96b-44b7-9dac-01f2a94637a5.json and https://artists.proofprofile.net/proofs/artist/7689a2b2-d96b-44b7-9dac-01f2a94637a5.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 0x637e647c7df877abf0e7308f75a5cf319400f5c7f4a8107f0a87a3f89c6dee11. 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/QZGLM2346377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c198076de12911534c16f0aa73e5bff808955317e2e77aec5303522faa0a82d. 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/US25X1900969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f15705366d82c05e1bfb402b83dceb13da459dba4dcba00ab529f7cc29c9a2. 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/US25X1086022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b97a6584d3f0d7b3f0074b1c34c32afac2d88e9f1c723081b522d66bf06a87c. 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/US25X1086026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5384b6b5d94c44077563f906f1c55bc9735387013a79cf1df829fc2d83b1aa7. 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/US25X1086001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce3a5c442bc410ed172fa6cebd4277e9c6e2511cd1c66fd9f0d1b19864c4e49. 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/US25X1086004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87f4c9ffd1048f12213c99c9a8b5763a97f8b34c47525711a1448ac22e8ec72. 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/US25X1086005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b00d479e3fdd91b7deef3bea8909758766b0ffc4e5d58e132d81c5b3560a404. 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/US25X2203314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a687bdbb2fd33ebf4ff14a501472680ebf1c7f95ad5c1d20ce843f94a78967. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US25X2203315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a1046976bb1c4c963d8348078d4fc53a0677bfcc02e2c648e15fa564f19e25. 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/CAUM82200303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e3f13df47c850753423cad83e6829760d44b3c969d4cb3754f93348ff2e6a6. 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/CA5KR1956231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0201e52b82c6f3094012932070c013569d06306d369532c0a89c130cad475bcb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GB2LD0901225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a64085b0bff2b84dfe76d7509ffce5ba7a63e5065f1ec56bbdc0a554967f1d7. 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/USUYG1583299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd342e6ed63ad190090467757da5b2cc491e96039a0d84525478de35eb7ffd91. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZZ4J2401310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb3a893e2f6de572be3bd2a41d6e927b5e7207b710325795e6c26e650679025. 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/UKSHP2100194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59288605f6089c0a3567b337f6d2058befa3bd651e97ff32b739c5b0bc22a870. 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/QM24S1821383.