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 0x39847649d3194572fa10804585f0be413836f06d1f71298c098c3d766aef6cb3. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/97386e03-e3e1-4e70-a30f-96f10bed5999.json and https://artists.proofprofile.net/proofs/artist/97386e03-e3e1-4e70-a30f-96f10bed5999.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x5c7713de87d7c2ab15e910b7fe5aa24e6140e7947f38084021bf579b363e14f5. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/PLI411300547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1c8e00e848e376023206a0aa20a37da412aae88929f6199765e8a7b2963e7f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLI411300548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e978e8bb458f46115aa2c3ea7c3868ef84337cb2e031cf61fb926a9001bb96. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/PLI411300549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506bd39096e3bcd956d15236e7aa85989d49f7acfc04248c42ba5af6a55aba03. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PLI411300550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b4913912c14f0ac6e155b0a451d495c61e3e95081d5814e04bb6d1faaaf334. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/PLI411300551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702dfe886afd889e937e7816590a540f48021dbd87a0fcc3d01c772c2316fc80. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/PLI411300552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8a4afa45311f7e21d3aae265f2f1e4ce7e9ffceac5a44070a324e0051c46d2. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/PLI411300554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03495c6256d38c73b90df7ce2a80052c6b08efc3d73e1ccfe25a4ece89694c1a. 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/PLI411300555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8f5c6af4ffbba4b03faec88b6f59104d1c3eaa1ed6a13cfbd1da03cbc4f5ff. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/PLI411300556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6114a4392e1cc4429e5120e6a5b464b01025bee60ca0cc6ece70d54899461646. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/PLI411300557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734c7b105c7764f05c0b830955f1670ccf903a23541dab137fc1e69cb7d02593. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/PLI411300562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fe7620ea72789ed95ebd1bc691e38580808f48c1d5edd9dbb1a78688a808c3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLI411300564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb63efff70bb54753ecef2b26b19f4548ea7be7939cabec05a6176f8783ca68c. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/PLI411300565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439592795371e08d2fb26456a640a11cb3c096078779ac889946d570a5f55b27. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/PLI411300567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe311d9cb86517c6ec74766b9a29d5c395028449baec19b10d84717b8ad185330. 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/PLI411300571.