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 0x0b041e306fce038375da4964d6d54baaee2b7bc773aabf5329c8e3627056c848. 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/a4e0355f-6497-40b2-81ac-8cf47ebb610b.json and https://artists.proofprofile.net/proofs/artist/a4e0355f-6497-40b2-81ac-8cf47ebb610b.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 0x18bd5c407769e698b3b17cc41d38b88bced4844541b8e76b031513530b96c2ff. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/QZES71867550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd249b45b8d0ede76ea6a40678013a96f2b72e575e3bba60602c71649bf895edd. 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/QZDA52132787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21843ab308e4540a461c8bcc210281c2b652e7782e6a0884a52ce3f089b861f2. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:37:08Z), 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/QZDA52132788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35e7486fc162e7e1cda942cae24b8364897654773ce384a46df2c521a5de635. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZHN71969994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca741c5161473cd41c51fbf0a98b03e0dae1e7f56a4d1523d61b4fad40a07dd0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA82032495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dba1b4b963de6d58b8823a041a7ca10a94b5fd073a3b00db6f39442416b32fe. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZHNC2350007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d9b16a569fa341d70400777d63b83212ca2bf7bccf14fba775fa9d5fbfafde. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:30:46Z), 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/QZHNC2350010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2298abeccaefdbb22e70b14b3aa32a73b05a2fbe1c096b4508b7c4726280cf. 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/QZHNA2201853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9260b58dc1bc65dd98fc8f09cff287db706c80a9f806ed4cdd16ffb501239c2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZRP42315932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362ff6d51d7bb639ebdc8567cc30d58a89c75bee2e6d3e19c8fe60c6c1c10521. 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/QZDA62373971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0388b8e818638293c4222847865f5a9b43d0b1a0fb4efc12ab461399b7fdc4da. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/ITA642500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72ca7d8ee8b1cf53e47e5d5c1ec282dad0cad87ce1bf47470dab523f97af5ca. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/ITA642500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6911bde558459ab40e98031a4f8d1ef075944018c3c9ac9fab0e42d06cd8a69d. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/QZTAT2496780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfb41b2ab67f9c6d7d7d4a6573852ce697cf94320b9c304608f206f2e279f41. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ITA642500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab09d0ecb6e8158eb5ca0dec2779223c4fde0b7bf73790e39e1b1e0979e452f. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/ITA642500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f52f754cd4c7cb2ec80fb89143bd8f6af5c5794c6f1b97f942808f52710cf51. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/ITA642500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027be6736ad8c2e5792df4a850dd18459bc725c4a710e44864a3271dc19d1f24. 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/ITA642500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3d518ddfef6ccc588d57f17e1780bab7dedbf78f36c50a5c8c5862bc45d96b. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T08:20:31Z), 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/ITA642500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cd1abbbaffd695bbce81ab9a6d7a4fe726821fee85e93a610b6839cb1271e3. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:48:08Z), 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/ITA642500053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95cbba9793cbc55d51dc7ab36c18a356b911e67652a8b9ead1c37e96a3c04ea. 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/ITA642500054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6911bde558459ab40e98031a4f8d1ef075944018c3c9ac9fab0e42d06cd8a69d. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZTAT2496780.