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 0x2df1198295523671e50d4a27196fad245864ff2616eb885badfe039cb292bb1d. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/66ab7862-81bf-4046-8eab-d8b24ec90b2c.json and https://artists.proofprofile.net/proofs/artist/66ab7862-81bf-4046-8eab-d8b24ec90b2c.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 0xabcf257ce602abfe13951293b0ea13a96c817349c30d6a7270e6902d19137a07. 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/BCB6I2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92c08778b2b401bd7d9cd5613f6e066545a59a63a21564d6b77faed84b95e03. 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/BCB6I2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa841cd29c9033f38274749d7adb53a1837a234d323cd2e8583bf1b57a0768f3d. 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/BCB6I2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78918f4329e8ff350340bd75d6a14316a1366dd7332c39fcd6f5929a33fc0ad0. 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/BCB6I2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2321c1ddf6fb6608123acd8732da55a955463fc2a9d7f69cd8014dff9ec77c. 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/BC5FU2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bde394fa3c15101580633b668c9549c582573c58e9f200223f343146d8e902. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBRKQ2273409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca78ced166c44390d777199bbd1e34e7619c69015be0b0675291aef6b24f0855. 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/GBWUL2282868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa3c377b0b605442748158767005474573441b2d9d31ac117b00737f28accec5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBWUL2282876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de69df417dc9bb15cbddf8d0f47f18ef6c0283ba2e1914376c943d012b56ec8. 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/USYBL1901392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632eaad4b0dc7f4cc10ade6fd86368ceb840c7ab3309765875bd9fade8522342. 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/USYBL1901393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1afab8be4009b4b8f3e032d3bb54e50814e682b023b0e3c89f9b4764572b9c. 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/USYBL1901394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0246e92f6a924ca75192d5b0178643c73fe219786c13f81ff5cec78e95b6c4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USYBL1901395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65cdd6c60b8b8e68b91482fa3383b118ff976713062d4d63ce192740046a3e12. 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/QM6MZ2074162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa524e08226595943284d2b2a0a109caf1adaabe41710cdd6ccb03467f0fa268a. 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/BRDEP2400203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80d6bcba947bc86eb205d78e639d727babe5905dbfc096b8a051147a126964d. 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/BRDEP2400204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da1c17e5092e51eea11575cbfa2824c12abbc5e4161f296c838cfd5aa63caef. 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/BRDEP2400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17344d76050cb6c9258d6a07034def3eb3f600b8216b501ad0de5dc18654adf. 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/BRDEP2400208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc92c1be09940b32041c6f9aebaf1ad87f9afe7186a2a973bc47dc80b4c06b67. 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/QZMZ92153281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9e3779142dc1c7d5d312c4d4abc23aa9708e1f67ce8917dcc643f3671bcc61. 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/QZ5AB2122619.