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 0xc1b9c92f04f102660d0e181fc8c22950304c2a16413c3612fedc2dd682266b29. 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/42dfcd60-64f9-4ebe-ba59-7e6ed5520bf3.json and https://artists.proofprofile.net/proofs/artist/42dfcd60-64f9-4ebe-ba59-7e6ed5520bf3.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 0x0abea41d5350a5ace9e591226cd663934e80461eb3ac40438a665d04b0465d86. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZL382036467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa523bbbb46411b15dd2e552cf9719ff590b7941477cefd7c59aa87f36df23e05. 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/QZL382036475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf72b89a5a095181cd7f0dbe3137147b0ca954bf79e46b96c4d787e1f214a10. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNMV2173429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f340686b35572fc29ed4622b3fc4e14d90f4584881a2c7f815970d1154b8180. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZNMV2173433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d86994954a7b8f9e2beb015682cbaf0b573894a48a4872b590c9509991e47e4. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZNMY2132580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9623632d61e5f37607a0cc30bc81cbd0e1d76565e57b917e60501d2cd17bb681. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZQAY2205108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c224625b62577f2257e6bca16cbb91b540a4bb55f4f2c930eeb3dd8f0dde2c. 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/USLUU2200362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045671f2fa525e84b5cb0b59aca1f7f1e4f00653d81c7689b6ecfd1a7a2392ea. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/QZNMU2313202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261b3e3ea4b681dc13eeea16bfc7e1fa99fcd0e9673384522d97543538921c40. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNMU2313208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8536c520f2672b37b86ecb252eb3d96aa20e1f253a915d455cc87726e2666dad. 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/QM4TW2512628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb3f01aefe1e77d11819af9f3507c48e4e791be37ca4d4ef2ee41327e1db274. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QM4TW2512630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0620c448081247bbfa17d6cd85549788e3365f8104bca6995d812993ecea57e9. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QM4TW2515696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e02196a7cac9d89c811e811150c6f3cc74b84967e6c7a902d4c288c21b9c56. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM4TW2512623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1167ab5906480f83be829aab94b261666ffae656391b9fa4725749a0fb3c756e. 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/QM4TW2512598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12e4abddf4ac0ddb89b7518ac9a19934d2156651b45d3e7cc45f1feede8076a. 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/QM4TW2511531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded86811cbb33a9788a992c3c89e80b223bf703f8780e2a3905657b3457759b7. 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/TCAFZ2264909.