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 0x2e94ee42a10ed90e3a192ef6bdff430aa5762cbd1d234161665e614653dadc4b. 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/a0f721f4-20e3-4fa4-a9e7-bc1d22d2d656.json and https://artists.proofprofile.net/proofs/artist/a0f721f4-20e3-4fa4-a9e7-bc1d22d2d656.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 0xdbdfe11a86484ed44efcd1570c68fba09ef76985497c6659797f015362e9d137. 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/NOHRW2306050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215b9cca05acf9b1aaca273c4695f7a7da4ee6ab70203d6220fd95230b7b824c. 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/NOHRW2302142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bec20de7bec03f2ceadfbeb97a763745ab9c6da8a5d63488b08901ba8af9e4. 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/NOHRW2202141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd249778d5fc6fadcc388e333f709f43a9fee8d20bc04b069579e78e23767bb. 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/NOHRW2102040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ef7c701ddd0d565c82bea4f87b3af35b1c4cd2f998173b4d4f797bc62755bc. 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/NOHRW2102030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec8040778aad2b210bbb159529b7298b9b22cfcbf0fb7fc7c07556ddd6e6b26. 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/NOHRW2102020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7f7b866c7f00ad9c6611220ba2ff585882a751f8916ea98cb3e09e02afdf31. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NOHRW2102010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74b4d889a3efb05f054899bbe79e85fe80013f7e2ce8bef3c3f9ca5140080ee. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAFG2069934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e07414aa22a131b98104bffc21216e36c2b6e6c90964da60301673a2dd55be. 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/TCAET2012688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6765b2a917f7f32114ece9a08bfe741bc515193b7360ead0cea2d7c483ec39c0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:12:51Z), 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/TCAER2014259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc95ce105f813cf3e660b0242d1d0dee40be0529c6a7a7f5da4d8df8452ae0a. 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/TCAEM1928183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e8bbccc27a3bf617ba1b316b6d971e440d8396045189b75d3379d55c00118f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:17:10Z), 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/TCAED1915276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d168b0c2e7ab4b9147f97b0e9ed2aa80147e79ac4453000f3aabc7b439938e. 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/TCAEB1916772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4626f9a897f715d1c0c65960fe5079665b97c11fad5f943dfc9df50b88dac169. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:17:06Z), 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/TCADS1809080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe984f22197dfb8b6fe357b1226b2debef0e34d44341a9e20e76f37d3b08a256b. 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/TCADH1780894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8d8a230eec15b7369874dff2062f3e395e5b05d894f7fb37cbc1e325e0a2dc. 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/NOHRW2406070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44054c1380284f128d0adb209c2531ee0b57de25fa138f24ca3ba7309344eb9e. 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/NOHRW2404040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455caa9f2b46baa69567b45266554856ff25c2d161c8db4454ac9d7051c0445f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NOHRW2403070.