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 0x7490f9f4c53c3d7caee43073e2c76876c446b6947692debcd3f79568d8ce85aa. 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/ac262b83-db6f-4bd6-b847-663bcea13dd9.json and https://artists.proofprofile.net/proofs/artist/ac262b83-db6f-4bd6-b847-663bcea13dd9.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 0x000c16777332e272bfacf1338fbd93ea2f8a78c7bb6863cbd00970e2c0b83b90. 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/QZ7YY2290068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445446ceaba808b13d975b706177d45d501a47547cdac9601629f39715fe5dd7. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZ7YY2290069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bcb6296b10d89174363863b665541d22fc6b47994e5c107267ffcabb914411c. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZ7YY2290071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197b72f9b4d88db10c14bb01bcb1b74091db3fbca000a8c087523ccacfa2bce9. 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/QZ7YY2290077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8738b7296ad099b77e6410b11dae5f957ae77778ce7d68461ca3d50be39602d6. 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/QZ7YY2090215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8566bc0ffbf179e18f8b19990a69a39ac4dc18c851ccb949c8128e2803b8041b. 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/QZ7YY1890216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94185a2677c8bbdef4c8370e6a556c8e39c98aef8273d5297d349307fec697b3. 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/QZ7YY2490006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc930726f72047c10d6ba515319e20e7a397d23fd493838e9c9b4d937757dcd38. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZ7YY2390201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a29104db01a48499de8ccd8badc42cd8a0c55bfaad86f950c34cdb44186a80a. 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/QZ7YY2390001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2259d63f5ce02f6623267725498a73b2829a2aba4e3c3a76bfeda6c1653b7cbf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZ7YY2291065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54cc3f576a93e224e465e57c185c7fb6410496b35ed94b0c3a31ec161e2da206. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QZ7YY2290066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f121b01006e7785da01a9b53ed59cafaf97ab3f30a128826e66f9ca73d80b7. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZ7YY2190537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0beda4a9e3c8f683eb4bf3c27460ae48f234aaff083ab028d4c238d46a408bb1. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/MXH152100508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c85cd772c6dd5b3881af0232eca8368210468721bb3a12551d1d6e7792885b6. 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/MXH152100226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8738b7296ad099b77e6410b11dae5f957ae77778ce7d68461ca3d50be39602d6. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZ7YY2090215.