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 0xabd5c6f651cb29348d176cd9571b8edb9ca8cb461df8ae35cca7fd890646dddc. 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/d665a718-3aa7-4ed8-8547-80e8a6e447f7.json and https://artists.proofprofile.net/proofs/artist/d665a718-3aa7-4ed8-8547-80e8a6e447f7.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 0x18f548ad14a190fff562cd4646d2d0128bfdbb19fafe7b067efffce4db19dbb1. 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/QZFYY2192127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6126661e145c268669e051df42c2dd2387d117f968ca9dda008b53dccb0cad13. 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/QZFZ62112340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f25d675cd80fba16e12202062b682cf12d2153d0f6cb7e7d7bfc0c9dd5280b. 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/QZES72190961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c908cb6f3004e905bbf7082e8bfb2c0fb1f366d869f0077da405396a693a50d. 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/QZHN62101009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90b8abea15c3a949c4f6a397c97cf3e177f248df5bb6bbaea90b98a8012c0a9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/GBSMU0008335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9420533b131e0c0642ddbad4e04ae4aa7bc6c555f9cffccb1bf00bfb3c2e5d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWT2101819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5f6a4b38bf11ecc9927338cc987ea284ef113dc607084ef1f8df90f8293f99. 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/QZDA82233362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5f6a4b38bf11ecc9927338cc987ea284ef113dc607084ef1f8df90f8293f99. 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/QZDA82233362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76cc0d3827d82cf96cfeb9e5c40cf6c1f385c633129b504a8a3d152da1668a99. 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/QMBZ92277029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d662dafd9e584e7d252de060cfee2b61842e561c3fb0f13945cafe6bf398d99. 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/CA5KR2314161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1694559e8bb20f61a0045c6a2037ceb36a58b85592bcd6b141b273bb20d707. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QM4TW2379441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d1f1f85d2ee6fed3cff1b03a6860c4e932e307b66c57499bddd5c70f8819d3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CH7812353678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8147f02e337bcea02f0dcd3bbbb5fe30d30ce8f3d33367ae8d2d7c257e60c67d. 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/CH7812353679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e7919efea719d8cb78fd406682efb320c277416f9d649a2df7505187a47236. 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/CA5KR2307052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd262d971f8798a155d623639ea9876703373c464b11aab8135438dde3ae8544. 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/QZDA42465365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91e7398c5f5e849ca4956f1edf28df759ab048781ad637645b842daa76a7480. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/CA5KR2430818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0345ab8862f4d816453ddac99253df65685c38d8ea1026d52d1e09e7bceb88. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/CA5KR2503493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f72c7b5b2fa9529de535fe0b489102f822ee8c7dc6af4e9cf3a6012f3ef3f6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812401398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8452279af69adbf817ed536c5a43320d49fa1c51db3f1ee8cfeb870531a8816b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CH7812220867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8932bed5ccedd1e15fa7eccaa1a630a246b057dd6fa250043ec199e688ff5553. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/US3DF2072633.