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 0x65f989dca35594d4af3cebf9a7a4b75d5813eba580bc5996669c8dd50737f3be. 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/a0a94382-42f8-4012-a428-14377a836d30.json and https://artists.proofprofile.net/proofs/artist/a0a94382-42f8-4012-a428-14377a836d30.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 0x0b0d6a574c63845d76c048df750e3fce1b0e3bf940b25b05115826f6571f40a2. 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/TWU712205653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d7cf9ee004ce845f77a9d094b98ff5148404939027b845145dbf9a9face4558. 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/TWU712205567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1054d8293f317f07659ca6440aa393b6d473c362607525175db79e637440326c. 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/TWU712205611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04435a75fa795fa58583edd244a29aab3da6b2b89f8eb85f9374551f31ab42ca. 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/TWU712205577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4234a0e16e19f66ff979ac00d6c77da29be1f0a048235d4be7d9a86a4d58974d. 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/TWU712205595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a97ce1547401a2151e79cb24b1c7aa734c06cd2527a4fdcdb38729ef28856ec. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/TWU712205609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c04a5deddef4002853fa6355e66080c742396f0f03b7dc5ff402ef004ef46f. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/TWU712205597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2c5cdc747be97b7874fb86a45188035e83507acc49c2389430f3407554cc54. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/TWU712105998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eba1fac562e6f1519924d9c257d8eefc3f6aef5945530021287f1886e1f725a. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/TWU712106034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681384518f5bd9a8520424b3347ddf6accedadee8d3117866646d13c1cd31b0f. 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/TWU712106164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b032b2304c2e15d01a6161103bc66b122589b81f8784932b273b726d8bdb4f. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TWU712106132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf711b240590ba091e324a860c1dab969c106812c62051a6729a1aae2c52a4096. 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/TWU712105879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2b78aed796f89093c7b75da1bc72b8bbea5455c9e0337d32e54b40da3d08eb. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TWU712105855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce776b6d95ea3681e0dfc0afc97164ae3847fe2b878976fec0ccb88e82635d81. 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/TWU712106134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb025747c42fe6c88c58c93ff2e7aba06b0674d48c4ccee8ad9e5dbf3aa96adaa. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWU712101041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f75a1f155dcf691a3207f30d6541a6933c361c4e0b8fd1727ccae89b9c693f8. 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/TWU712106078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbbc7689cef036e073dc750df8a42411e059c26f6995d06c3b89a51b017490a4. 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/TWU712105760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1131aa4fc90c50e9263c7ed85067bc06739ae932e52ceea139765b9bf2ca6f66. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/TWU712105730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7334d67a6947c2922fb99fd7eecef9827bd78101cfca0d31ddd374f8852984. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/TWU712105728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994917752ce3afa0473c51a4fb7fa5b339d999579428081e6a0f9bb1156706e7. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/TWU712105684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8919ac5a605b7ecf4352b7a1740dded4e28f15179158481c36b6e678fc306885. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TWU712105654.