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 0x6e299a02aa4eef9e04c870824f02112a57d5f376279d9d6b16a8c11cf599e70d. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0dc32180-a8d3-4959-8ad6-67c785539b35.json and https://artists.proofprofile.net/proofs/artist/0dc32180-a8d3-4959-8ad6-67c785539b35.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 0x30624c30fe7a3780bb4fb9d0dddd4e122760fef37efe73411f57426ca6df5482. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TR0341000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc943227b0481fdd5e6e07cc5b6049c29a57091e8568a81601a9559d0f7dd15. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TR0341000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54de8c7c36a3195bc2bba3cfade026c5488c85288e3416758b5c86d141c22f18. 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/TR0341000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9de22b12761d60dac20d2c63ba5c8599c35aab26bd5389e481d56e4892ae84. 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/TR0341000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc2dc2c68d5bfa8bf7f508c321e8006cfc02784f4fc118091f85126ce5f92f3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TR0341000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e26ef5a90d80c5a01a9f6ea48896854c2a364b4b58dc61201015365bc84db8f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TR0341000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae58e4d379f899a5b7faa04a4ddb4afae279c43401b83459428492e5212386e0. 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/TRBBC1700041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7237dc4b929352bf69942a92713791b2289ec525386b48744df8cebcda11893. 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/TRBBC1800122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c53b504467bf48aec06a606eb6573b68832d8559bdfe9bb1609cc1c1abd6bc. 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/TRBBC2000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37abf1fa36a4a72a2aebc5c587389321d2d6766dbc0be81b8ac88a437e7e4890. 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/TRBBC1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28f2aa79499100c91226d0e69483de53850b6fbc617bbb4deed3b7f22b7cee1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TRBBC1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9003893564bbcdfe8fe95659eb36d1793a9aab53d67cc0831045e61db181f78b. 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/TRBBC1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655e882702d02c5618067a2339e6ed370dc24699ee1a4bd044ba261df91273c4. 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/TRBBC2200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b74bba32f2c7a2ef98f53a36e3033c919279472504d8f2f019fafaf485be9b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/TRBBC2200034.