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 0x08ac0719a3fefec5b76aad36009805832c17aa67f4afcafee2188059633a8433. 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/30a98212-f569-49a1-a147-5cf2cb436622.json and https://artists.proofprofile.net/proofs/artist/30a98212-f569-49a1-a147-5cf2cb436622.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 0x5fbdd1d9cdf4382796d5d8dcdd5c11fa8de137a9a316d9e7a504c349caf9525d. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T19:04:09Z), 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/FR9W11825486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb2f903ec744394336ec2ef1d98b133214da1b66a0dc8b5d5fceff764b58f4b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:18:04Z), 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/FR9W12142179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf491707f8a1f37d65b2506786b02856582ed4d27e50e5b8fa66bb7bb8deb26d9. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FR9W12142182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf5885fdeddf79362e275c60bd07c16217da53bdc12b84ed4b1df722eb62f88. 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/FR9W12142183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ce220e3e87e62e51a2d5d9d27feaf399bbf69c1bb5c9d851032d912be0c780. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR9W12142184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f3e7a69d612a4f8abf1a26812ebc8b973bc2939aa12e701a927d198e49e5dd. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/FR9W12142185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30654c25019920445350a4874b5d6cbd1ca2bd393784ef8312d29e4ab52f15c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FR9W12142187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a6e4480f7a599eb3155b50241c33d0d0dd1146cea274702c085a1bf5df1f3f. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:59:55Z), 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/FR9W12142188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0dd612a42a1e6384e2c35c079aef42c3d3b3e488a62c6a5e30f5cbe18fec8b5. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:33:48Z), 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/FR9W12359751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175e07908ad86c92bb93e662b9cd43f1c076b20cba0b30ac7ee6e5699cab3ee2. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/FR9W12500755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b99907de380bf52d51b48fe66f01c1bc4b221a664daa0a92d1f41832b01556. 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/TCAJL2541991.