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 0x0395a3a919f47d05506af6f26d73cb4ce3310c4fea35232144168e585fe4eb65. 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/1db0c558-999f-4b0d-b109-ac46b6040126.json and https://artists.proofprofile.net/proofs/artist/1db0c558-999f-4b0d-b109-ac46b6040126.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 0x8ef18f4036773c24fcaaf63d437579a0951f33c42d667f10c31e87012dd060d4. 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/FR59R2286089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863c7e541e6fa2a8a479a2846c2c6aeb87ff0f92749d8194ffaf2c139b51cf5f. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/FR59R2286094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ce34e14777d92a48fc1609ad6d4478f68162813d16888b97950e8d4e5ade25. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FR10S2266166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7ca0f84f68aa7ef0359f661e70fe9cb870d60ec5b4f4aa400a560cee3129dc. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QMFMG2370720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066d85f59045cb3c8e58a13e0468a83338f130b95f7fd55d272491299ef6ceff. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QM7282550661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9581a4e957e4210bf42369a63a60166722545f976f715781d58fabc26cf32478. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/FRX452151746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e0397d9d4e18295860363eed583d4a02d0db4b992c1e63d88413421bfcebec. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FRX202215772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054a10799ca0f485f9ee4a8419e771be29fea3dcf5853a18b82ab93c64f0dd93. 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/FRX202215773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4fe4886663cf91c0fec7c395f5ae9ed80078c3662bb7fc721a10baeb3e5dee. 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/FRX202215774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ec1a9b3b76c7004bc76f1dde74e9c367c3c594be5fb77ea877f04f5bac290a. 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/DGA0L2320575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d5985fc3a3673319efc9ca534ffd998356c02c0f7c8b546603053751645253. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QM4TW2441355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd09184f44b0fbfe166faa8ef01b2a13386d1c85147ccb19e6ba709c354287c6. 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/QM6P42423280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f9bcfdc268996e76fa4c005a7d07668f297db18661cf84b3af119a792822c9. 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/QMFME2418750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2644673546376a79674c94dc90c2789c08dd1d25df5f988abe64b968272b4a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QMFME2582494.