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 0x4e84630c848ecc995e763067dc43412c190b207cb459910d5c2566843a5cb081. 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/5b32170f-0707-4970-92ad-2d2b3fe65726.json and https://artists.proofprofile.net/proofs/artist/5b32170f-0707-4970-92ad-2d2b3fe65726.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 0x9f34ccd7ee7c844c9d96fe7b3e3bcc84016ac3c3a2e374e9f813049aec71c0d7. 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/TCADT1879565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3640e6f9092a6061842ecf68027cda0fcb36ddda446b0209b800eb4661cc229. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/TCAGB2274935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30e3ba4c29beb4719d03d39a6b74dbf48f3d3bae57524d13ff712a99e866e67. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/FXR852500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e8f4b1a2e7a3b0eb7a21ffa9003f4d53cf5be980546e9c219d912f264f8117. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/FXR852500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81dc490ecd19772e4329bcebf588be4e7db1ee88786e9ebfd280936eff051b1c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FXR852500029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e2eb7a7b24d82edf77001e26d787bfe2c17c93b52e3d00103fa92a5de0e791. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/FRR642200139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c3f9af5f495bb269a2370a6655784318a6c969985cd4bca7ed6c35eb00c913. 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/FRR642001693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf426ff6b75d6334c8fb708ac84688c1350b62bafb7bf915741a9d4713f08ada9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRR642001694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2307d5831e97d2597f72747acff8a41d17cf1baf70192f6c6f828306853f0d2b. 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/FRR642001695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe91e37cec7b5cf9e41c7e256d1cf31faf1e6ec558ce8ca34d7359e500f07d46. 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/FRR642001696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b077b2a45567c365b413c27e9bbb2a969c53668376edbcada0332ba597d20fa. 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/FRR642001698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb287c2717a6e0ec309e7fdf9197be224d3b7d7da70281dd07c86ecb08f0b0c8b. 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/FRR642001701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3b635217e197d4d3b2480870eb3936908c681b19d688267c90e44bd49bcf0b. 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/FRR642001702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e353caa35e141dd3c7f2e0004aab0790195665a93acdd1595d948f36fcc99a. 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/FRR642001704.