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 0x2e2203b2891ca81c340743bac512ed7e0597f8162c3a7ac11da4d59ec87d9112. Chain 2 (Bitcoin): anchored in block 953614 (2026-06-14T08:40:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/17af1215-8020-43c6-bc4e-1fbef02acd20.json and https://artists.proofprofile.net/proofs/artist/17af1215-8020-43c6-bc4e-1fbef02acd20.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 0x74b24bdd6c472090a0bf5184a58a6fbf1a7d8d927785585f37188faef8db35aa. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ITZR81900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b6da93e99531f0c61ce9123d6ebf4112164e718423948645de468cd588f90c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/IT3IN2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9abff063ca235aec9a64dde50d53d6ef669006230776573c21bdd93834d335. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/IT3IN2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119d8742315365bf0e7b35796768e352d1aa1e521fe746241af664ef5fa53ebe. 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/IT3IN2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1bc2a29d7d6b436f8bbe3786ed84461013d21ab75413c68dd06e13347f358d2. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/IT3IN2300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce3e4f0425cd1ab83348e93da77b35d6d438973bf76ed1f13c9a2ef705c42ce5. 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/ITC491600034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dfcf657b8165c59b31e8a4f4e15799c1eb4e7e40c38fa21367a7a211356e752. 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/ITC491600035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996cd69b72e296c2f56bbd10793561ad319cb3ff63d78e170a140bd17333fdfb. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ITC491600036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9142631f06f049671f554be6c4747e409deed276a853e6d734d9dd2404ddfdd. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ITC491600037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e180aa1d733c0fecd344e465204a742d48d5136beaefa30c93daeefe7f7ad3. 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/ITC491600038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5500a17681369560191c72e6754016ff56b5ec7369c20d00228d48edf7df40f. 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/ITC491600039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bee1fe3a06cb230358983f381f3df8898967eb348acd4daeac4a70962633c1. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/ITC491600040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54671bb985d8f0e85ef36ae763b5db245b7037e2a0e83e2095f4b0720ace70ab. 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/ITC491600041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc45b75931699d5324494e9ca62801ef54c9bf5c65bb6abfec68d5ab25931ce1. 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/ITC491600042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccb9018c3968b0892ded84f2abc0b885e47aa00c19fd03c735564cef4539641. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ITC491600043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729aa65074fe576ed327958c3834eecca8f77bc5ed152cc2455a46ca2e7dfc69. 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/ITO141400051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d55d75f12a28f378c0c01c4fd55a988914eac0c468b106f535890ac97565c5. 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/ITO141400052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c404b0b5afb970931324c6eeb56c26de464f94c595dee6c28bd671b0f549fd. 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/ITO141400053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4d36cf172dc8926dd1de4e0d2a06e243af05ab0cf3aa55492045be67c94a7d. 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/ITO141400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635bcd32747fbdb60c4cd9fb7a6fe09ebfacbbd171c7207dbf08770ae5bba76e. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/ITO141400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2251cbc0c87f4c8c42b1d1b53df9bff826d0499b48c5b433e878618866670d46. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ITO141400056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9014857bc233e0cd0fe701cd8d96e33ccf6c967bcb306a1731424070c69e086d. 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/ITO141400057.