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 0xf93cd5a05ad4eb0e2a725ad81b59f6a829c46c85bb18a15949dd13189b3b4cb7. 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/7fe8e3ec-7f84-481e-ae94-809ec903426a.json and https://artists.proofprofile.net/proofs/artist/7fe8e3ec-7f84-481e-ae94-809ec903426a.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 0x92f315745372dcbc6b2bccb6b3d6f5846ad426cdf1d3e964950237e3fb772b84. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/NL4TH2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c27a4588352174007f4fe32cccf60df0c318343d35f1b8ed9a14830bd50f98. 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/NL4TH2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7188a2faff6e4d30a37d968de680321ad1756c4388f91beceb573790c6a8aa13. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEG932406133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7646af7637f7c84202d7da168fa080f833d596edb6d75cce3a03167a20ab9d4c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEG932406132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7188a2faff6e4d30a37d968de680321ad1756c4388f91beceb573790c6a8aa13. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEG932406133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6cfc732cbbfa012afd45c108de1ce6ed9235e7f406de1f8969623bb4554f86b. 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/DEG932406134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9532c1490ddf01400c3c0d98a2e842eef7564edcd20845bb31c5b83ce48c7ea1. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEG932406135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc60005d7e1d9038ba3bb2fa82f67dc96eb3727dc74ba16b60f36331bcc115e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QMFMF2340914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6040c00c922073d2a2abdd4a19ca4eb4ab7237beaeec883464665d6d134a92. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMFMF2340917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202e12c0ffd8334f2bacad135932bccdb838395702d1ea117fa44f19dec20119. 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/QMFMF2340918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0574f84c8c978769ac2a203eca60f6f36d1da816dd0c3b58fde7aa288630da22. 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/QMFMF2340922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ab0a1ea1d369d44f112f3e68728b5d9bda377a8869074b91cce25ba6d986ef. 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/NL3AA2250019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3372e6a98ed5955bee6e36903dd77ce45c86f81640f9212faaf2ac7719be1b84. 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/NL3AA2250065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a70d8b4c4205f8e3304648d0d3967d2fb46b65daed61ccf3c0f02643a45ed1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL3AA2250016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69c4ae9a4a918aafe065400640e3966bfe57eb5ad0462e9406693559f9783d9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL3AA2250017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3086117bd1f517014fe61858fac579b7a44d87034a746ff1260b5d282bb77b3. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NL3AA2250067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7160e2c0b0271ed1710551ceaa144b882561e29afa1102fe5b061f68832a7a59. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NL3AA2250068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb87ae7971cde646b99dc3b00e22c64608d5c33426d5bf671fe669a64b0f3d3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL3AA2250018.