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 0x6fff20ebbf31ff5be5d2ecc7d78a54724b114c084d17daf985f73f9e4db719f5. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1cf31719-155c-4c4d-b168-38c1e123f170.json and https://artists.proofprofile.net/proofs/artist/1cf31719-155c-4c4d-b168-38c1e123f170.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 0x95b778d2b5d59bdcbf5222aaffc8454efccb6fa63545f1e9f761cdc85f1434cd. 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/QZHZ51905063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622f17ca08d2f5d802233ff0fec86b145a69229b0bd14a9da9a3838c59443c8a. 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/QZW9L2343259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d21b8f01f8aab1a0fb9d743404317e0e5c2be7effbac2eb170c780c2886e8bc. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZHZ62250065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0ac38059ff50c809b9bfdc0d0b0bd8f9ecce4c55f1931e7d72674b8603a77d. 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/BC4102100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8076f28bed4a0e49524282c3ae293499add3236fbca0521da197a40d6fb5d9ed. 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/BC4102100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239e99de7c87145e4dd557bb2586c3dc89323dc466117ff8e38aac164573a077. 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/BX1082100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f78b0b706c8934a0bd8deba209b507286fb2da6167459da5bdd005bcb0cf68. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/BXQMU2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde3f6b3477373967d1d5e8a6805aac36ab5e997a9830e3f3c2bcf605567733c. 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/QZNJX2169564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fc7ccae893de21168f3bc04a2030fc8868825c42e44298a2236c4a4d997ae8. 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/QZNJX2169567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953b732ff0bb2c349f4bbdf2c692410db797880df0b637281c48f7bdc2ca18d5. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZNJZ2434103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a267290a6898a3a62d8dd3a463b3bfa31155af6afc0df5f0f6ac2e988022ceb. 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/QZNJZ2434104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8add87461841475e075a0b0f1bc5471037a494cd4ecd3040f41b165fef5fe4a6. 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/QZNJZ2434105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69895fc9bcc5ae8fb85b66388a12a6a2dc366fd7f21d151a62ee47e4f7ef599. 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/BXT752500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81ac3497b30fa72de2ebe7a9b2114cc737b94c0c0615868261fdf4025193ca2. 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/US7VG1977342.