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 0x359c708f3d9ab3afb08c487b735ced2db591dfe9233041c44afd1230f31f44fb. Chain 2 (Bitcoin): anchored in block 953923 (2026-06-16T09:51:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c33b0f7-b39e-4f2a-9290-71f3fcbaa264.json and https://artists.proofprofile.net/proofs/artist/1c33b0f7-b39e-4f2a-9290-71f3fcbaa264.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 0x8c963948bb68d37ae1c3b3c021e49718dcfb1b0185663e93383378a5cebc4b73. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/GBLV62121126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95398d039df842fb40bf15d72216e75bea221f2b3e3b6216da6137a16f054883. 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/GBKQU2358634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb15649f83e853d7419fc841a6796081c0730447a37e5062f32d061d86481915. 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/GBLV61800526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f68f4817a5885397c186491ce36a7bcb21d637562621aa7b95c5e1227356eb. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBLV61800527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a8532c42e52bc0ba6f66a30ea6bdde6c9fda9fc1d6617c4dbe42e119161e3b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QMZQ41629001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06936fb1e11037301ed8ae8dcc336d28db4dc3caaa64e0cb5cf0cb460f07d307. 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/QMZQ41629002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d56a2d4379e57e6152b3496adffc80f6c857ff165b6d6d1f2edf1b7702645c5. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QMZQ41629008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfc7a24f9b4d025296fecabfb38e699347cef4fca231480397759222230b4b0. 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/QMZQ41629009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d22598770f7f28b77ad4b18eb40ef6ccf3c62905a9f1489f8c646c7dde72d8. 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/ITA061302069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f10c4ca5d7f90af1d2723f8730a1d2d62f828e09d3632f27d0f7a352a00a99. 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/ITA061302070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a80126fe5c1348967d6a3f724c360b19c6c5b5e5da720a4b4bcd5937573022. 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/ITA061302074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc349b81772b5cb872bcb44261941876d124e753d7dd2f7524ba0563fedc8238d. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLCK41057390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf32a78fdab598f92cd939f02df8d4df26671570751f3890687ee46651226e2. 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/NLCK41057391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040098dcda5bf7d5847e6a68b9eadb2cadb8eb03211f85258c2eaeb866d056a9. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBKQU1852717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5f2fb38c68174c8083c82af9091eac4b14bc80789b586dd8ba132f3ad1ec77. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBKQU1786446.