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 0x1931684821a8fc8797a09c1ef82ab821cf7018335a7c68a46f5078b1a1f9d826. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d229ec4f-03ef-41c7-a5ee-954fd63faab3.json and https://artists.proofprofile.net/proofs/artist/d229ec4f-03ef-41c7-a5ee-954fd63faab3.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 0x12b21a26f63bb549b05dedfc9161f0323ab2deb8c9bfe8f9c003948ba660aa6b. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/ATCI02000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aec8e6b5e596bf5d801a3b4a028323b3fbb5f451b1364aa2900ab7db9902383. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ATCI02100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf1d3f2582e1a7c88eea3f607d6e39ad09257fbd8dc9376d99fa8ed1c009c98. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ATCI02100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b21a26f63bb549b05dedfc9161f0323ab2deb8c9bfe8f9c003948ba660aa6b. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/ATCI02000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4535350a81cacc551025e3b8013c981041e35cc02fa8d31c57e1d1c2ade20ce. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/ATCI02100039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9202c7cd3361d4c5d4fc3da680ee26ec201880f6b490843e1adc38798ed2410c. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/ATCI02200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0e48faae768f296f9afb4dd40bdb2f4acb24bd35bc9344b5c004df29219315. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ATCI02200062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9202c7cd3361d4c5d4fc3da680ee26ec201880f6b490843e1adc38798ed2410c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ATCI02200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4daf774a1cd884a95ef63e6364f0a42ee7f69642ec8383a9aba865a398bddb84. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ATCI02300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f0e48faae768f296f9afb4dd40bdb2f4acb24bd35bc9344b5c004df29219315. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ATCI02200062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1530fc8e343e4da5ed28d04b5f369cf7b9d19e6fe6982dfb2229c486dc3982d7. 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/ATCI02300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8f5c9a0a0d5f1cac7e77fa648c781530a3e7bff77bcc88c7f3ba063f51b446. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/ATCI02400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9202c7cd3361d4c5d4fc3da680ee26ec201880f6b490843e1adc38798ed2410c. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/ATCI02200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8f5c9a0a0d5f1cac7e77fa648c781530a3e7bff77bcc88c7f3ba063f51b446. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ATCI02400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33a3221bddbfaab738ea9937bb579c61c99067a075830ae0a0c8c557dbf38e4. Chain 2 (Bitcoin): anchored in block 957690 (2026-07-12T10:16:40Z), 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/ATCI02400044.