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 0x19674277729fa881049084ebe089475d1b75e4e27d7cd4fc3821a4c4a561521e. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67fc326d-ee5b-4959-a2bf-f892b5f18688.json and https://artists.proofprofile.net/proofs/artist/67fc326d-ee5b-4959-a2bf-f892b5f18688.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 0xac268c9df1a32989f958021064bd414bde36461463961189bbe69d2dbc0e7093. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FR9W10904836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4f5b671fcdd0528d66561505116d82f3da767662e3ee35ba9160755a64a826. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FR9W10904879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f47cdb7158c15dbb27c30af33ae71d2a64f1e8cf34ee47ed4e05fbeae0e07e5. 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/FR9W10904936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b2c1da5079ec98042d1f4e4728ead78a9651110ba91cfde0a00b34b96fcd3e. 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/FR9W10904935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2afa9f50e9bb946d3f4707b1fcb2d8a546c6bcdd11884b70470c71d854ed1c03. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/FR9W10904931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0815a9c63cabddf2fa92c2e4dd732a6398d3ca357d753c689096f1ad0b178a. 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/FR9W10904940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9fbeab10fc01536143e3357c8c6c7eb1c0d33e27a55e85608c7a01b1738507f. 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/FR9W10904938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce8af4df356dcc992d14fe39f4a89a1b05d952b9315b91ef4f15829b2db2380. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FR9W10904878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6692e50c3c06d4e75fb44c80d091894a367726a7102c9b5ccecef677d1cc58. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FR9W10905332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dcbba5b3f5e4fbde51e7a9bd418f0cb9c37a9780b1a31cbc8df6f73cbbbe97e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FR9W10904952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac268c9df1a32989f958021064bd414bde36461463961189bbe69d2dbc0e7093. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/FR9W10904836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4f5b671fcdd0528d66561505116d82f3da767662e3ee35ba9160755a64a826. 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/FR9W10904879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f47cdb7158c15dbb27c30af33ae71d2a64f1e8cf34ee47ed4e05fbeae0e07e5. 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/FR9W10904936.