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 0xdc0f2eeb536ea5248ce2754ab11bd161bee8b2cfd9ad8f7416c569b5ab5af436. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e77e0e8-6829-4fba-9432-86d752fea572.json and https://artists.proofprofile.net/proofs/artist/8e77e0e8-6829-4fba-9432-86d752fea572.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 0xbc8b13b773ded80b610ff4d59e7d2c6cdcfc39f794f8dcb3534c539d1dc042f5. 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/FR9W11310374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36a39f46c8c69056a3dd4e33d3ae26d0cee88caaf3010914a6bae9b20e71292. 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/FR9W11310375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8573657727f56cb936637e4361589242852712cf9603d27c2597f08b15b4eb. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/FR9W11310376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e4675f3c319b6f48a6b1c9f7ab69e14649e3afa607433b7d908e4eabf97a8f. 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/FR9W11310377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e7c47a1d7966a4ebac2119bbd2b805b2a028862f6374a185672dccf2202d66. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR9W11310378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51acf0bcc7a360dcbdf56e42f7baa5f91ec50192eb79cdabaee3cf04700d6256. 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/FR9W11310379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f724d495c6bd1f1a5f4106d5a177c4fe448e985c177a0d9e869ff987ae3e66. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/FR9W11310380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fabe2c96a1be70841e3c0539aa04671aa92a5d7579e79d93a94e362ddd77f7. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/FR9W11310381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8c8f3b9c806a40213fcd752445b8891ae54ed5af8bdea7dff77e5b574bc1f5. 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/FR9W11310382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887df7daaac0717b56764d22d742e75082002cfd08ee17f7953a32446e28b431. 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/FR83J1701650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d507afb481dbbe8bf27f0cf8103a2a94ef411b270d0518726e720a7bd101b16. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FR83J1701660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109f532a1818ed17a07f92260b3f11c5e2a1482c0a1c3dca91baee179d1582af. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FR83J1701670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c820f66bdd38442b4c117d7499f6df2e294743e38daece518209839e0885040. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR83J1701700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2b7fdc7999f39fbd1b4a4593942a73d0f00a7fb2d64fb5326b98ff06ef5339. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FRZ131477010.