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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ddd6d210baa496d2efee7195ea245bbd7ddce9a78428ece43dcaac297f2499. 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/c1e0aff3-0aa0-4298-8453-ffbdd92e3785.json and https://artists.proofprofile.net/proofs/artist/c1e0aff3-0aa0-4298-8453-ffbdd92e3785.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c43d45dccb1d12de9884e85332352e1e1e613baaabb28b7109364c229e9dc60. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/TCAGC2299666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1780baf098c11c1ab9a14d97ef269d04de9d5ca5b331ffd90eedc8b9d7355399. 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/TCAGE2258386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd0a9842dd062bb7d92f41b0ba021121d4f858288b385eef1cd6a732d697ce7. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/TCAGG2285770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412c234b4559e26b2797538aeeea8272ad120431fc2e7f0e9967cb2b311f9b0f. 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/FR9W12329779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490a3c6eacc6f1c18f1450be0655fff47268b6191d2dbe5a3f4c7b7b15f5d608. 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/FR9W12420311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e80e1aeed5ef11fd9829979bca0c5e3dc1a9b23aec885c54cbadf032c67bd4. Chain 2 (Bitcoin): anchored in block 957868 (2026-07-13T14:56:55Z), 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/FXR872400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe135caa8856591f7fde5cda62794c503a7065719f2733eb7cdaa082bcc3b0274. 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/FXR872400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7286d9bb6599b07be8fbc288370cb959e1996e6ca88aaa31fb55bd19c737648. 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/FXR872400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e85efb08cdfe1d7c33ee56f043671d89daffecd3d767f3718a2dab815f11779. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:48:07Z), 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/FXR872400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa119dc7c167577d95c0d3ca493d50654a9c4f7a8f812f340f18f2657e2c9677d. 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/FR2MX2300390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc389c0870ba27bbe3b42ebc0602dcce3f35f310f7a6d38734d585a2b6dd77e82. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/FR9W12359691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc389c0870ba27bbe3b42ebc0602dcce3f35f310f7a6d38734d585a2b6dd77e82. 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/FR9W12359691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa119dc7c167577d95c0d3ca493d50654a9c4f7a8f812f340f18f2657e2c9677d. 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/FR2MX2300390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e6d748d66a8c00570565ae5a9282996b38390f50b646bc9de3ae38a385609b. 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/FR2MX2400180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e17853fe08dc7e7802c19dd47a1150b90253a0c79844a873c5b0dd9caa525e. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TCAGR2291673.
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