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 0xa5312c19ab5659b8dee4e22510b74b8caaccfa349ccb5431b6217db5b686cbf3. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b03aaccb-a11f-4161-b34b-b44df3803678.json and https://artists.proofprofile.net/proofs/artist/b03aaccb-a11f-4161-b34b-b44df3803678.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 0x7e5df04f5931b3d1eefd5be571d49feb69a243a2813d8fac1210d38c97930996. 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/QM7282054775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54615e80e0f46d1d1263e82c2a00e691243336568ebc5605ae45e031a3f51e7b. 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/QM4TX2035013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00043f80be37290e766d3ab7e3e827ff2cf1bb46268223b67354cb9ff0fa2155. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QM6P42017891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a24e19db38b06a513a32b28b6428f7911d6bd22806d6bd28c3f39aafafdcb0. 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/QM4TW2006640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f5b7ce3be697fdc4afde1ee659b1d40ece2e5022fbe1be5276b3b516ee8a70. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QM7282054786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e66ae34baf1c0f216375acd779721d567d039b04569ef3f66a8a437cbb39461. 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/DK92A1601001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa9fc0b1a2c7d8293ff3aa0e9a637c733c84532efd3dbff78a1dac33ee41133. 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/DK92A1601002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e918065cd5a3bd83c96319c59972ec78db7e241ae3bf736bd66adb7103a848. 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/DK92A1601003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf490cebd85151d79b8e473128360713fe0063f837a653ef4b38196e3d02b1e1. 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/DK92A1601004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2d9ef198a8ff5f2066154af771ad241c2ff1d112ec0c15474c84dfd15f9621. 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/DK92A1601005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1c67b43a23282df790ff6f27aae519bacc4a83f026b3510cd8f9e46699cabc. 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/DK92A1601006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef4f8b62c47ad72e420fa80bd645da8b7d4bd2f60e876c3748e36442f161f00. 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/DK92A1601007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9437ae57c8c2b8ee67abd1228977565133c211d84c3fcdaaa09e25b52672fff. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:41:37Z), 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/QM6MZ2062579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f9ec18581131dead161b1c77ea15e06db600ada8364e17e268c6d25b1f04da. 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/QMBZ92064222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab4cc6e7f7e8b60b73f8d3347e1ee9a0d8177f5fdbed977672520541e39eb19. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/DKUM71800368.