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 0xfa908f98a89a7890864aae2085f0c6d043d47786ebb1e9889a70d461ea87a483. 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/2996a469-fafc-4c16-a1bd-cd6f2a5a782c.json and https://artists.proofprofile.net/proofs/artist/2996a469-fafc-4c16-a1bd-cd6f2a5a782c.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 0xad6ab805dae015ed95663cfb7951ae064fc94980a705eadf2b88bc117773d1ef. 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/US38Y2509285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82202adfaeabdfe72b3922882711a237b96f8818a90396a8bddf811effe9a502. 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/US38Y2425940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2b5d99bf62afd4fbd78c9dacf4d411910bc03945145be03aa4698370e93bc4. 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/US38Y2410714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf67b0c2bb5235079825b64d060022b038f782597768211c5debb6b6415a2556. 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/US38Y2404064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae031d30a41c2f14c4627acb907aa56b9e162c027fe60bf3a29e616370736c93. 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/DKH6A2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf43272c4200aa25685e2d02c4b191ccf1448b7e0676a92ae23c8450b566673. 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/DKH6A2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6262d6d81e698b0cd8e59b08b5a03bdb6899868f1393372f7c5106fa1618cde. 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/DKH6A2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45de7ebd4e12f3a54211ec4642d2b78781a7a57e03980c738f224363291b78a. 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/DKAZA2300083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e6b452d91d78013da55a7a8867348454952aba2efa04a6a0e914c89cb10757. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DKAZA2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e6b452d91d78013da55a7a8867348454952aba2efa04a6a0e914c89cb10757. 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/DKAZA2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64be29a331c50fa6139965d74214f2ef0b276488573176a21456a8b76053f94a. 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/DKAZA2200144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4169ba26c9996d0f39e03e275effb252f8f60b570dd736b3f6ae9bcb16a0cf8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DKAZA2200122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21f31c1ff7b08e72963155b0da48363d6f30ca27be884a5f96823a1aaff8b07. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DKAZA2200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4169ba26c9996d0f39e03e275effb252f8f60b570dd736b3f6ae9bcb16a0cf8. 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/DKAZA2200122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21f31c1ff7b08e72963155b0da48363d6f30ca27be884a5f96823a1aaff8b07. 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/DKAZA2200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3db3bbe2b53be34d3220192c1fa40d121c6fb528ed17143ccabda1214db4b68. 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/US38Y2507989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3ba059a67aeefb09fde0857764cbe9bea8cb69fee5068ae2043970b71318bb. 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/US38Y2507990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e0bff0d2126957721df94f3fa60afd89a19c6fb793df6556eb2ec2fc3a3c0a. 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/DKK1H2400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c8f2f82b0172b719c0584f8e193011a0e50434fd3efdb89c122f36c19e6075. 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/US38Y2420993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ae2d306c72f1934ff158fd8ac5e746936f7224de70db02d718c3e4bb0eb831. 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/US38Y2507992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf784db4ab64fc9244c71b7f788babd8c6998ebf3fd0b192ad45a6cd91179a38b. 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/DKK1H2400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a9426768824a13b3c78348f43c3263d7e2319f2ca8ff3c890cc8143763dde0. 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/DKK1H2400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07579cd96dd6ff4a8d7c3667a31e0402609d2457dd9fd5d5603adb7d7317ce95. 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/US38Y2422639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062ff9a1fa4008b7ea54f2c3affa6198fd0ce520838653da1b62a51936e28abb. 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/US38Y2406593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369dd312a7e02fdc1198ff2443983945fee1ccdddefc3b4b981ad8c7612097f5. 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/US38Y2501133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7bf5387281357fabdf8aa40522a0580b0e5df710daa5df8bacfb6a75e3a3ba. 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/DKK1H2400107.