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 0x8f66f763b10e196b2090eca02dcb16d57720111acc648670335d40f7885f41dc. 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/3b1bbe88-e967-4a25-82e5-adddb40caf99.json and https://artists.proofprofile.net/proofs/artist/3b1bbe88-e967-4a25-82e5-adddb40caf99.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 0x8c594c5c01f4050ff66a38e7f1efb9d1337fcd0407c73d32f1d915f034cbeb5b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/HUUM71900039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6366e6673a8e7e4e38c523a036a3f8b545d965de96dd94c33bdb6f3c12594ab. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/HUUM71800111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da7c48e9a6674fe5d2bac796796f4639b2163e38dd15e0a209489bbbbb70fa5. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/HUUM71900149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa894374b9ee40a9f5e938500023f2527174450dbd2b51dad3aebee25b2fc188c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/HUUM71900217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ed5c1b56eb69a1521a218f4c0d92d835a75e517ee1cfda4cc860c026a8c635. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/HUUM72000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f018bc19758f2af2834298b51f291ed771642ff43c6170bcf2e394daccc3b8. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/HUUM72000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e222f9642073efa7f86b27793516ea741c8d41699aeb88ddc5083856eed5176. 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/HUUM72000078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ae0d0641ba207793c9ca8399061e0015717e132621f7470aabf29f91b8d17b. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HUUM72000470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87aa0965078216add03474ad10632c75d55eb9bf2de7eceef261d41e359c08a2. 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/HUUM72100463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x761c9af9e5d7fe2031eca3e476efa3887deba5964e6208ca45bb922cf017102d. 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/HUUM72100466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d0509a6623570518088bfed3d9dadb21af9648247fae8cde8e0aa1482c6c99. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/HUUM72100464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957c43e62a97f651dc9e8570e86b841c72ce2de32c8e6cc5059c8bf650eedc3d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/HUUM72100465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d570155c3519892ec3695d7017e09295c7ed8b4372e2edb08f02b2519153654. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/HUUM72100462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7d847815194c098363868e95ef704a23962d6712fb8980ca8c6d11a53437ac. 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/HUUM72200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283fdfeacdb09339d26a2a63834623fdcc41ca01446c8a67f321600c25b7b1f0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/HUUM72200021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933d456b8d13b0285bc7945d8f979b17de77a8e6f1e90d2dcc39e5395fcfbae0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/HUUM72200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe44f81aa4acd9191e3c8e7438310b09de6c289c776b98d04ddf4d6900c65d09. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/HUMAG2500306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4deb9ff4243ee82ff85dd0dfa84065908f4ee9abac83d5f67f5cdb214d0ccb. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/HUMAG2500312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee2c56777d062c5cf24c11c98d7bb26a6db5985a664ff71faa735ea7657dae1. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/HUMAG2500313.