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 0xe5f8ae208f3452dd1100255c07ce6460c651c059442b9ef38fbd1843152cb9cb. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56f62c90-4e30-482a-8955-821bcfa70773.json and https://artists.proofprofile.net/proofs/artist/56f62c90-4e30-482a-8955-821bcfa70773.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 0xf7ee44040612786e878aec825037a632aea73c585b0b9d199d829249d90f8b01. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZDA82303047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590d52c321537de5ed3d8ac3e41bcd156fb4339eabb86e163a83c7fabfc5efd3. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZTB92222587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445d40696a7f23498b8231461806db35b189cc119fdfa9a33cba947887df934e. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZHN72219996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0d31bab245ddb96c9cd6e6721ccbdc72cf0b708cd2cc774295047fd5fcd993. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZNMT2115780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ac379aca4e84895b9531ba29f8f595dac1bc177a8482995130a873d5e8a81a. 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/QZNMT2115785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29cea5c1249261b34302d4107f2d2c34950ea1215eb0f930363ec44277241ca6. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZNWZ2086324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d1f2322bbd776da4bea58487b716cc06a92c56dad2f27ae31270d9a38a4836. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZPLR2054955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ecd4a126e0a3a2a43433b7d3cb8f2b6c6aa5e40c7b5ba3f1c8981344e3564b. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/QZWFM2381357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9309595ecbc93dd42b175b46a8c11f29fae1b5c5cc8feeff1a899239b9e39f. 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/QZWFM2381359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb6ddc2beac0213ea857e7728a6ab003f5c155f5e6ebb16386c1cbb679a5a7e. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/QZWFM2381363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18ef87aa511116ebe8131e630682c3647b4c6643d348a7cac8becb9156ced7f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZK6F2569348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb5c165d515302d9107931af48f9b0ef44fefe4ffb30eb20744a337f81b95b8. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZK6F2569352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a40d0a3dbd0f0c5d0e2eec1a34029baf1979da6249683842dca8bbb69650ba. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZK6F2569354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd0bbc5b02c51535eeb97c48791cff52ee557d9cf4ebafe773ca5056c834cad. 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/QZK6F2569356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29215e957109e6c9e0b6068f0993ea472aec8a9eb76445473ec93f604ef396bf. 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/QZK6F2569357.