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 0x4fe51a8e831ffcf80227e2ecb37fd94c0fd33a5e5065f2b036ee0ea39138c1b3. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b761ac8-57db-4b46-9a55-5d5f5d183da5.json and https://artists.proofprofile.net/proofs/artist/5b761ac8-57db-4b46-9a55-5d5f5d183da5.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 0xb7b5c6072e9ce45a7ad30bc9f11a43cc039be351c90e8cf9236178255dd0dae9. 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/USHM82437622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9053741f7aaa3d10fb843f48b21d98a05dea664dc630bf758e7c5233ead29d94. 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/USHM82477564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920ba5408df0032a0b79a4fb571c4197426ff74ba7a956217dd37ef9c4ae6fb4. 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/USHM22568957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c3150032443661ad237f924dcd492ab239d209eb9b06746d2b408ac95ed419. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTB32545022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219efbb5a0a28bfcefeb9e650493d8a88bba56d6e0b18bacf05657d0baec2849. 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/QZTBC2555456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ff97b8b07d89994d0e0476510c912a74f0e339978d097f1ac62c80fc40516e. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZWFH2572401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d730a8a33e12d524c25cb4f89dee6f8803ffaa5988643528aeb41fe5030de2. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZWFS2571425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceeeb1f2cf02b7f06dc99f880d347c829982ecd6d73beb6224c6a76bd23d9d27. 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/QZWFU2557991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625e5832eeb85adc640e90fa67b983b3b7242b4b68552452060b44c2698f4e23. 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/QZWFW2549392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962066d07346e9b88f83010676d3bb0fc1bf394cabe1259b4752d01a655f6571. 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/QZZ772569349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea53b1d14c08077f39f0192dc08b95bf78f2fae80a7ba7fb235e5bdab76395a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7L2541350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef8c2b4c2072371396a3124903ae46feecc92b4b1f494f4291392e6351cf362. 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/QZZ7R2515703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac36384b1639858867eb2ee767c39023b07d62664ff8df6867aad3fde72e5cd1. 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/QT3F32545374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ce34f22b7bcae3a7b1cd660297c8c04406646c92bb05fbcbfb243f4ec6dd8f. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QT3F82563112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7642650fc811ab2ca9c650b282067376f513d785ea0b74f751a5f15dd52b9b59. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QT3FB2500416.