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 0x02ce03f7a05cbe59899110e2e259b9604b0e52dd925bb3d2768b16b4207e9aac. 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/7facbaad-c879-48f3-b87f-c9cdd4275367.json and https://artists.proofprofile.net/proofs/artist/7facbaad-c879-48f3-b87f-c9cdd4275367.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 0xa7056ee8fd5287e445702a791feeee67ef905dde88eabc7de395f1362e422424. 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/US3DF2212011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb411fbeffc03211fd3167b4c7220a42ec777a894c0fc8d18b47ebbba9a4573c2. 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/QZNJV2249814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc563bb22e7f3d89c3a005b8feb2081c2a92c68379adf96f662a3f2923c761e79. 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/QZNJV2249836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11375ba5cdc858ba6073ffe2bbc09a415783ac1d70184c065afce62eef4a9620. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/BC2TK2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07fde78cc4c74e0eba5abf4f4015e671247e943df0c20ecb1a4d167707434306. 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/BKELR2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe9bd03490a2be40514b674c4abe1693c463b868ccc850ece63bf000d112901. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/BKELR2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057bc1580013a0a2b8fbd5e634e0eb0f1249769de5290fb7c7d78907e6b75070. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BKELR2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c50749573874119adc892a7775d9e1cb61f8ae98dc2c2288682e4fb519e7595. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QM4TW2419008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b97b222d6f6eb3cf2d904d1a4c8ea0df20f79343272e3a10bb2bf99ca5103a. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/BK1P72400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a0f91f751f720221b6361f9699d02d34521930daf7f5d912369b83c545a0ef. 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/BK1P72400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103d6cac81c11814fea869c0cfe693242cf8ea4b73439e0da33b58647d9f3248. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/BKSAI2500122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8573d62fcbbdb0712b49a3e3a7f6a2df4ec5159daa3fc71948e8d4397b71acc. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/BK9FZ2500048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa831121eabb563be41bbcb09acf37bacf1b3ff1a2872f2bc5b9b595cf629a6ae. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL8RL2408639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028532ea4686a3470e487afa75bdefda5082578c475cc6ab6f13dd9ae167e8d2. 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/BK1P72400152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a12012f56698967f47cd384c782e9c330f01013bed5c87d7be9b53acfd146d. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/BKSAI2400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5ec0722af4bbfdd90b0ea6e814e5fa385f7759525f5bf01d12502bcee985c0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BXGFC2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe843eebfd53187581d86cd4c07fe119f08fa670a8ea14fc067b625155caf0291. 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/QZTVM2209304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51761ca97522da851d343c8dc9a71b2c2a2e479124dccf6aca17ac9d2a7af6b6. 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/QM3DF2252559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c5843657167890efd91e4140dc4c57396f32def44a6e3504f1edcef587dd07d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTPX2395973.