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 0x065bd39af28faf87ec124aeb2e1d577af0d02db6fdcb7dfb05ddb25ae07e9632. 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/f472ab15-f033-47a1-b9d4-97f761ddfe14.json and https://artists.proofprofile.net/proofs/artist/f472ab15-f033-47a1-b9d4-97f761ddfe14.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 0xb7e736c28c097bc3d1bbd268d3adb62c6a964a7b9aac08606b209f5116ec78ae. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ESA012060954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078166ba9a93dbe51a03233a07e9cf69300968927f3871890a44cfecf343faf6. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/ES71G2105662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6792b9a77bb9acf58c01c0990bbe1142533f5f7d57f526752b0af51daaf3e8c2. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/ES71G2118614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39aa58e115817198a1c58b6d31953686c161f40f3d053f818156fb93d930d2b1. 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/QZN882151898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94755e0d4870f7aa2ac02707353d61bf37a24815890959de549b19bbe0e1658a. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZN882159125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c4d481a9d6439f430029e103484f316cb9821089fbbe067c08f210f3b700ec. 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/QZN882172242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab802023e44673b99f4c487cacb401129e8818437395d19591d9eb010e6da41. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZN882181240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c00f12667d291bcf47d083fee44768510efb4be96e5726e45c1ebd0e809aa5. 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/QZN882203408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fccbbebb2228c2cf7ea7b9241e321d78971abb80507daaa9b25cc052a6cf0eb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZN882215039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b812f6e00bdbed5e677d290d50ef6fab12329d9d93ee2464e2f3141b9ca0d0e. 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/QZN882224859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bb7a0b07a6b7329677ccf1be3960edb02370b780704ce8406f10a32a452538. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/ES89E2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x281feaa7ea423ed40d2315ecbdb16d9b1d9aa9ce679e43c985c2f70fff3b75b8. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/ES89E2200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf214f48b4c4fca5c48ce96a816fb53e4c22fb6ea55bd343ba3a74c8a5d0d4a13. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWDW2203543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a93a8c0a97ceab705a730d33196aeba9b7acc1914cc4ca661af1416f6d3e24. 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/ES89E2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6caccd325bfdfef7f7b75fd137d354f3d8c20c03dd328f0950519aa2801b11. 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/ES89E2300022.