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 0x27783db9c1c201154ae2853c2402311bfcef1eb0dbee317a4c2662e3299fe689. 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/16233948-43d5-4c14-9a36-f9cdfbea13a1.json and https://artists.proofprofile.net/proofs/artist/16233948-43d5-4c14-9a36-f9cdfbea13a1.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 0x692eb4a7c39d6e133cf556d78518a928d8026e3dfcaa8eaa8a81966ec08fd992. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZHZ41965797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f12b9d994e3227c4f8c3239fce197867562d12cc45ffe871346a960aca97af. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHZ41965798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d97cb1b4903476b3033922cf560295c664a9d3031c9f68e071e0d9865dad1f. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZHZ41965796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881d8b6b7ac3c9bd9ff908ba8d0ad3e33cc37a161ac6632d5f56bd7cc23362be. 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/QZHZ41965799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2184cadca56066b721a1711c76fea954c7c2c3b0da3996162d2ba6d00350e7. 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/QZGLS2088401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b626b770d9507d285446acecbdcd2d57e98727e7becb3a2d06e79eda00e7f9. 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/QZGLS2088407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eeff4eebc87477fb8fd396e6abca272347eabe4ff0dd96d660349c8bf37bc8c. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZNJW2033391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86cbd5aa3a5d2461b2a3e04c48c966f323b747f85b2b0403c008d673803746c. 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/TCAFS2117775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04089344531a9f5332bcc6ffaa987ada7b8c060866d60ee4942dad05f0e7de2. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/TCAFS2117787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92cae89baddd55e1f08bfa147934389d99f304ebf63b2e1b178d35106f3fd858. 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/QZGLS2088402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4611422112e1bb3caf87e163055fefee05845aa699e817a71fb20a4c5def27e7. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/QZGLS2088408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9f29ecad793912351a9daebc2d25fa79f937615a37178f3f86b1b266cd1baf. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FR2X42243387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce30b112f4ed2d62d877bcf736df39104e460b3318b4c5a6482ac256dac7cc8. 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/TCAGI2265796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79011f1efd081cedfb32967952c581bb6c39d0a896ef95d91bcd20b42b389133. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/DGA072336538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cc6fe603eec128183fdf118d37d1176973daa9a35ca4607e0100618e7d1af7. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/DGA072336540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31b2caa29ddb780a1e4b97278ae9f101b02c5a3db5d7f299c6019ffa4646eca. 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/DGA072336542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2758135acab8cd0c42cd5d48c7ce94d5be938a79fc93e97623647efeec513b22. 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/DGA072336543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf657fce9041a3bcdaa6f336ff57d9e0166a3abe67dc91b3fce27536ebac89190. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/DGA072336545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0fc74c3c393e61056ee94ae86182b69963503b7388f25ddaa0ed442facc9c9. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/DGA0P2437004.