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 0xce1f490f9d93632de32752e5a943900648b5f8374f5b46e00afd53d5bc5f744c. 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/c6905da7-2302-476f-8924-7ea4cd5743ec.json and https://artists.proofprofile.net/proofs/artist/c6905da7-2302-476f-8924-7ea4cd5743ec.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 0x089aedb83240a3fea8b2a26977d88f3e10dd0f96c752ad39ef18d12fc4886cf0. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DER720500035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137b6447ea537bfd45d02b121ff821c8dd7b97b62062e4042cbc43e072115632. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DER720500036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa256feb6dd7deb247d221ce3489f3852ee5995b9d23da07c68fa6057d381f62b. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/US4LK1302361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84db0a279898627670c5add2947e276259af05d1d354daa9786205139138229. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/US4LK1302362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3708391b2028b1343acb222cf464dee57f0fc1b34094dbf38535ca1d4be36fb6. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/DER721300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47e472e4635188ff2959f731b09f563f7a11d0f05e2d79e0c4b50f92915c582. 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/GBUR61700365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba9b4b9f3a58cbf9f043050819f381f026ee4924958cd8dc126c1cf06a09a25. 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/GBUR61700362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e434cedf639d181bc17913f15a6c827325e84dfdec49f4dd3c47a1f51827f84. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/DER722500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2964559080f2d93b037900be38f9de5c17dfada0b606134649601f0f2b0a617. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DER722500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac2d95754794408bfb4c33b3015fc7f2e9f03352ebe05bbf2c0105d963bed37. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/DER722500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4283750563d02e2edf366b219a40ffbd0734dd72573815b9c6f33709fefa31. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/DER722500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e434cedf639d181bc17913f15a6c827325e84dfdec49f4dd3c47a1f51827f84. 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/DER722500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc148526823d51195271b0278a9bdda5e8d82ca78d5607f5d25d22d2dead3d689. 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/DER722500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a8e24deccf0758cf65b53103a3c048e2eafb4f3533410d2271a8547bb661c9. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DER722500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3cd9e10f1fbf83cd728a0c4edab403d1a001f832f25b5afe319da7b82a802b. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/DER722500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5935ff52ded84159b87ce73e544dcb26f57d6f1e751f5dc364d5ec9c7adb4247. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/DER722500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fca1cb4a017fe92a2f363edbef63b8f01b073260b64c40d8aea8c71a4b44a4. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/DER722500009.
Writin' Time - Chopstick & Johnjon Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad64a0e5b7fbd17de6c28c068af2dfb1504386b3266a0931dc9d99cfe775f940. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DEUE11735336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d501f256d992f24496cb629ceb8e55dcf6dc1243bf9b6b8141ecb43c71f959. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/GBUR62000183.