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 0x7ef929b493678524b5b7046b33dba523c9aa4807a45852aacdbe689e8712dfad. 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/02b49a88-605a-4362-80d5-e6b84528a8c0.json and https://artists.proofprofile.net/proofs/artist/02b49a88-605a-4362-80d5-e6b84528a8c0.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 0x14369247811e439784d2620fc6980a803bab0fdcde19420b4fcb61158b537699. 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/QZK6N2075978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c2ad2ec75c261bd20068144ddb33e1804ee804dd5ddd4feed1a977a3d74996. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T03:03:05Z), 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/CHF032207362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f224345b58b9c60c3183516f2ed2ab3132226d2cb92b6af5539352e18a838e. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/CHF032391475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb64b345a5c1736704581f65c535119e2f059bd6f31799cfe5e6de14ee6429d. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-20T01:36:53Z), 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/CHF032391477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b6e4ed466cdb7cfdbf57a9899be8c6551e74958a41c0a99e6ae72bf1b3abb3. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QMDA62335767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9848b5f945d7b74c58c439c216592a5bd092eee9353a17728fa377536aa5442. 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/CHF032408490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260ba1ad7068341a1a5f6afe5ca508fd003b1d482bc52e13e1ee913845ec3623. 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/CHF032402410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf557e8d2a3a08c6b1e5e32801ee714c58937184f855ed010d36df27842d0823. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CHF032408122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ccd1c4b4d639be6a6e7001acfa757917cf3e75ad4d2ace988e89f66e5ce9b3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CHF032408494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0fb1f2d74528ee2aa24bece4b3fdeb3bd4b4005cf81480d9df5063689917c1. 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/CHF032410353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c2cbd6bf5ba92c5c1dcddd6de28202d38e58d45c71007661ab042318ec0b74. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/CHF032415228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054e1d25667ef33874dc82bbdb923c502bdd5a200c439c9c182e57e62cd83354. 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/CHF032415649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d9d7789596cba1e8c9094224f07b83b73fe729fb5e89dfc1c76d74f1f54216. 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/CHF032420674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d24c1d85bbd815715bf470934ec7de5b720bc886a7352b37d4fe5251624058. 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/CHF032420675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66493ba5d1a58f518e0d5d0c4a19bc625818df4ac1b391af4506c632962dcf3. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CHF032420676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e743725dd6422e3cf675c3aa82e20c8f73605e38a9a46c8a7809e60ac3c833. 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/CHF032420677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659274f053bec181cf87ee4cd1a6ab2e3d2526b7504de95d5741794976b22e29. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CHF032418848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3000ef5c5214c1e8b6bf2a12f3a4ab4ac81a9867e3deef79bd7f55d683456635. 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/CHF032420679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97164013cdc0e7974d890f41c1307c32c703fc227a7f2a7408e171cccc963cc9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CHF032420680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddb844c9169f4738b4ea12e6ce2a3e81e9219f36fd52175de7b34e06940d7ee. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CHF032420681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6238b5b312b6dcccd72e4c3b3bd585de8ecad982c2469e101ba28df72aff2f. 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/CHF032420683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2966d65feb5d5650e366a1130b6277c4963346cef4473a2bcab444d0af6ce8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CHF032420684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe35667a2fa9312575ca3eaceacb8b8157db902b07c27edd2e7d0422f50e350. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR2X42213953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3c62333d974f6e5fa4c9e8ac91f7c3fc1aebc959093fa465c04c2a4a15cf09. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES71G2400052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2194c10e267706a1fd741e29098406ef8271120bfc814debc6b4ff005c56ffb4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ES71G2400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811a4c26c618fe18aa7399b08f938c7cf395236099d1815ae540ecc327ca3db3. 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/QM6N22480449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb815da5865bcddfaea889edc6bc2444f29716c13357ededa8b5772356d7995. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/INO132200107.