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 0x83c2b80f231cb241fa7346bfb8184e43f066f0022ec7d572c6ec2c40a8cced27. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65980459-ab88-4e90-af73-af613a3cee74.json and https://artists.proofprofile.net/proofs/artist/65980459-ab88-4e90-af73-af613a3cee74.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 0xe4242469447a8233d6ddf38e9f7e11de0df2bcf940480feb7a31d1d7e619b3ce. 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/QZNRS2025293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe502e34d2f18d7bf097665788366e847fdb76463eaa1732b4c13492a46e22b77. 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/NLCK42221361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0179c8c5adc7202b70dd868e501fb7053bb49a36b70d72255489f16b6dc178d. 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/NLCK42221362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee5b7b72264c61290a9a7389f5d7e2d1b9497ec979ae73c422b70a291ef1873. 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/NLCK42221363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5070a5324ba43a325d8e3920c869a0844bb36fa1dc84adc8717a3e41c656ae07. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLCK42221364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c15147a3a877619c9761a206e143a7067f477b2de2b7d9a1e1b5fd6af313c0a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLCK42221366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f1972c485898dacf6bac2985675e821b6d5bd3c6b573af99f101b1c94bb0e9. 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/NLCK42221368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f56b9f2714e578b619af46e24795026cf172bd360f99cbc181875c3982f0a1. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/NLCK42221369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a26fb0fcdc5482db89eb33bf0b0d54744553cc1eb971f5367e268c6d17bb24e. 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/NLCK42221370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1e3267451a751fbd30fc23b602fac2b8e55ad44a1476bbb39fe7ee4592e45c. 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/DEZG72200062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93428cdef0dca76855c759ea986ec4a66228b9cb51c539f47e51239e6f560dd3. 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/DEZG72200065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2810844f584da6f0aaf96f77b0ba8bfc91930558608fbba289cc107d44e7d53. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEZG72200066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529ec02e6919713067e86a76a18b74f33b91f1ca8438ddee1571cb90534c21c7. 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/DEH742200194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06a599e6e389dc44d1b7cefbe9bd98e4e32fe0a80b292e5a916dcbe3d65adee. 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/DEH742200195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf17f2579c6b2afc971ba0e818ae06b0bfffde08939fc7af8017b49a5dfb3f6. 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/DEH742200197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca536fab80694789f6d61c65b01cc2fb90e752467ee3222d67cd9bef83b7911. 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/DEH742200200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d8932f71d62f5e8a0ee0bd95ae9764035b1cfa040d2320378d39d3bf106c31. 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/DEZG72300080.