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 0x711a6e7d23f69fe1dbff1d27a4b9f1f3a0dcaaadeabed914828351d04fe356cf. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c5b6b47-794e-4275-8b0e-c5b7c727779f.json and https://artists.proofprofile.net/proofs/artist/3c5b6b47-794e-4275-8b0e-c5b7c727779f.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 0xe09de84ad6645ce53efa2db85beea70136556160944100f00fa11d7793640961. 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/TCABO1349185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f00d2ac371b40f248743ebca5715550a0133c1410f3008d685accb3f8debd4. 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/TCABO1349189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050f4712cd2b2e13e165ec6e31fab48d1b54c74f97cb903cb1f2d970057d7eb2. 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/TCABO1349191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acff8245dddc824fc3bbd64a58ffc3925a91654228f2ece0e1b73830db86c3a. 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/TCABO1349193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b18e93e819ab28b2f6ad006c0451d4bc1c3c867f48a755cd7671c3e4fb14398. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/TCABO1349195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc03163028fb851c8cdb08332e28f15ea0fafb9c0f3b5389471bc87d300d4ed. 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/TCABO1349197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5551d3a83b5b747a057156c5046586d0ecb7eb7f725e45a96500bd410e3d1650. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TCABO1349198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11db36a4d8a413df176ec0bf1b5f773a93718dfb063dab43a572011b27aeabb4. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/TCABO1349199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005093ace9f00bf2c2b8ef5909c5f2598bb321ddfa2606e563c8902714a9f59d. 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/TCABO1349200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab56823eba772b9c4b9365ac1c0bdc1b6abf4588054e9e9ed36d5e98313b3596. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCABO1349202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbddd9e9e2eac1b853f312b8702f1fe0f0c10df8ba0cd8c1e1f4372080ece71f4. 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/TCABO1349203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72d5e6e340b1d4df144c020f193bbe407ac6ea6e05cb8d7abb44cc90cc2e639. 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/TCABO1349204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8c2b0cb4825b2858381c8f04e8f14eb44c037d6f2f420d04444176947a2349. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/TCABO1349205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7153ae7c9ba8a296dbe9941bd07670140dd407289442c3021941432e07b20684. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCABO1349207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff96f4a7d2ec294e4f959610308876230bb8364ea44368d6dbd2b9772e07491d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCABO1349208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457780385721bc6c78128596736b08079f90e7b36b5cdc31fd5518368264160c. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/TCABO1349215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7721dcd8cf2d68e4db9efda8baa0e96783325f9ea4477057e9e76f6da05207. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCABO1349216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d4183fb4d1efb534c832cc8857db680c81f45414c256115627a0ecbdad38be. 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/TCABO1349218.