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 0x463b8c12975d0685b8eab3cb431054be57e8c882288480a75445a3839b9562b4. 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/f142a83c-f0de-4015-94bb-4dd6d1e38f43.json and https://artists.proofprofile.net/proofs/artist/f142a83c-f0de-4015-94bb-4dd6d1e38f43.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 0x65d14d8b434ebab60a21356608f9ed288f569c46204d1e6ca6f9b0e522c51c7e. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/ITYG92200048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450d2d22426d5893bd4cccba8c7a9b8d42350f7db74a7fcba0f0af74db27a516. 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/ITYG92200049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a7773e1bd8434c7b8f43457f6aff5ca203a83b66d6b0bcccc9f6c132642e60. 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/ITYG92200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ea225cc3c4d431b6fff1b75e990e315d93aac826c86483855be90f8777bf75. 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/ITYG92200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1095db95a21591be8c79525b1701580a9d08545c870f1b476f31a72af9753a5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ITYG92200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe518e7a52f01198ab0b05d6c045a6b89b89e1ea0ef48a21c0dba8df85a6cf925. 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/ITYG92200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05dd5655a7064da020829c7ffba289b39049a1692d1c95553f1f5691b98cecee. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ITYG92200054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5776902eddd5d6c445fa5a321ae979488ba4130e3376c5925f83194eeb785f5c. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/ITYG92200055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d91afa23d55928eed814b34f885927e8f3682b5f46a4c97e3a5e0a73ab24f6. 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/ITYG92200056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde798e07ac3486201c90a52694dcb9f29216c0100a9f5c2277237b0f7240e15e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ITYG92200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77366190e5591aca194d536f2eeb2f678661ffb7a9a42cf25e05b998ce6dde7c. 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/ITB551915513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5127a30c1e23edb6a12850786def01a51d7ff67c42a7081b97cec24b6af4e3ac. 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/ITB551915474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c3f467850ecb64b71af8aaed637db089fb188be62ad5e75c820736a1dd0be5. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ITB551915475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415e5ee7c3f0ca90de98ec2ba90ad55eda93ceaf8f42655bc90de20528f2b80d. 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/ITB551915476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9261e451848e1f9f75958334913b4ee75240b3311c0a473aa3ab4403005fa16. 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/ITB551915477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9a6f29790daaa702e5c1852d70340781e6a0a17d2459900fd56ab2055a6f2d. 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/ITB551915478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1757ca03897332b5ca1aa0cc8355afa3b44cfd72f641713b915acec4d016a3f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ITB551915479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9213d48ac8c48097b7dcfe815a935903ea849af87352aee0d90643391a15c648. 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/ITB551915480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ea25483a7bbb72ff114a2caa10565800af06393086ea2ddba434f98d6d4cd5. 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/ITB551915481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09254687642a585b796a9a57c0d3631258cd65cc16e2b4d71a3fcdf897140408. 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/ITB551915482.