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 0xfabf8090382691b81b2c802e684c196d198628b150f36c57518ec3ba1c67c39b. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a15ba4ad-1338-4abb-b39e-19daa5dadc7c.json and https://artists.proofprofile.net/proofs/artist/a15ba4ad-1338-4abb-b39e-19daa5dadc7c.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 0x0bea4042fb53c773e47f362826aa96af065cd883b65bb5d6c134a17e433ea44f. 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/FIURA9600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bede4d4e18ed17e220a94d59a4f7dbcf97a8a7e4205560edb0237bd6f583ac. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FIURA9600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626f9d04dec1c3a9da808efd2d777962a8c1f123b177b2f5dd6540033e4bf7ad. 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/FIURA9600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b61a702d321820bcf8058c5b83ad5beb8e926ddab5858a4c403a8c2c1e60bd. 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/FIURA9600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae883db5aca8bd588cb110dd15309fee55b12b53ed9220548ac70f20d5afef98. 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/FIURA9600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db968061725ba400329db02155107d7fd9343f4f545fb142eba223a8c5daaba. 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/FIURA9600018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8146b581ea0844ede7b05ad89c6c7420cb6d63964a37b5f806f62045140464. 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/FIURA9600027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249028eb15af523242555e5ae35175a2b12b4b867f85ae5d5d40f94a59218954. 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/FIURA9500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11253f49de4d319f7335c43359378f0625f26e540dd3c890f4c3d191b8ea52ad. 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/FIURA9500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23135eaf00f9e9d55735da19fb32d7d6c9ded2a4a02c05711421105c7bf796a7. 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/FIURA9500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedbfab1c776539e8ab0ca584d2225aa31f4d3dff24c0bfcf933940ee1d9f769. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FIURA9500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17abdb464f07915870d1aa2ec4f2165b0cd385723f883fe7e34c71d12d8b1b41. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FIURA9500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c77f24de79e4d44e3a6aec25005c13ba1f3a7bd11f052a07324e7f59887131. 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/FIURA9500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c6179632b6b5c7c236adecbff417f97a78933870d18d99703e04107b0474a6. 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/FIURA9500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194eba127264d03a1a01a3e8cc4479fcc4ef672cd49f39111b91368acc99f8a3. 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/FIURA9500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256f98b3677b09b65bf127f66a64dde2ba50759ae2024fbf8390232debad6c53. 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/FIURA9500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3fe51cfb638866670ce2de7ebba58541b55aadf2f8a5ac77366204dfa9fea6. 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/FIURA9500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c6179632b6b5c7c236adecbff417f97a78933870d18d99703e04107b0474a6. 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/FIURA9500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62bdf4cbdbd8d328c9a977d86fb5a7271bccc9ce6f61bfb41b6952521e6052d4. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/FIURA9500034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522beec43644916bf6fd767816cfea76dfe75a6adec5eba7ba7ac98b3edfaa62. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/FIURA9400003.