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 0x6d6593844295cde3c7e38a85e4ab150b0a131ee3707a90f3e80b8dae5ef14b80. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c9d0e12-5ebd-4006-9262-3cdf8a936404.json and https://artists.proofprofile.net/proofs/artist/1c9d0e12-5ebd-4006-9262-3cdf8a936404.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 0x391db50a3f06eb6b2df50ebd46f23a8f656c219db07f7f6d02178d3e0c59f9bd. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UKFH21600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa81923281765fe991a4c706612046d0315ab2e379da7dea8213e12d43fa2cb8. 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/UKFH21600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfad233cda4b7c1f9000c242e9d9a6841c9fccbe6332a8d729b8463366c6e269. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/UKFH21600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8a5a0271be5590f0ed4b14c3576bf43f6a5b15e4fbf786dc4d4f4a2274442b. 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/UKFH21600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a411b858ce3bcc2834ea4ebe2b7102dc26c42ba0eb3f7ce895212a313b2157. 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/UKFH21600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0c3d771774524fa0b43746f484dd0c68320de492f88097c946330ba16f50d8. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/UKFH21600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8712c6df3064729fc3feb64b0a57424404472e485912064f4ae39c9c12f36dd8. 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/UKFH21600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb2d13cec8a8071a58bb4d6f71f62633a67c29992303a3577ee0a61515c08d9. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/UKFH21600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7152828bb949918d8b182e76050ce10cfac7bf88c454b20bf6c07646a9e5cdb. 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/UKFH21600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb212972fcf65d2bed9c1203065fa450639abf82570fbfe508b16be85dcc47205. 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/UKFH21600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06cea5881e9824e08766b48966dd57aecbc167f6d36b5a417c7fbb318ce79b75. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/UKFH21700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5dee1a7807140c9410b1e33d719abdddc5e81153cc681144e79fb01aaf6127a. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/UKFH21700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbad6dcd658cc96ec1fd7be276e65eaf12a2bdd295c9661299690c82837e6d80. 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/GBRPC1500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035f85f91bc589ded628b3807fbb03c76ab99eba7ee438223fe9819c3ec13de6. 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/GBRPC1500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d599b55d966d7e5385f9d62e36dee2064cf4e161b529403d3c8e0a43e28c9ed. 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/GBRPC1500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301263dd630e0f540f5b402b2a8acce414ddcbf34ff370eb276539e48ed7e09c. 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/GBRPC1500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe071333ee97a4f19e76cd4295eb966160782a14d579a7155ee62cb8957f5c164. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBRPC1500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad44f3e98911c7ac960a087ac79e7bb152067a3ff86d5480a4bdd1bbc565bc6. 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/GBRPC1500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc458f9a46797ade0199596edf96ae7c07c3e899cbaa1dc756db1148a9d62c0b0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBRPC1400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de8e0512a8ab74ed478ab19d98107225d8edbfb327ecddf775fb0dd2d02d907. 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/GBRPC1400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf896311428880d46cf0ce05325ff150cd16ec50cb1191396b9b4e3140b655f. 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/GBRPC1400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc005853674a19f27fd8a3701c5868c998ba14d061fc08c5f1456de6da7ec91d2. 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/GBRPC1400014.