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 0x2842ea3caaf807c5fd46f77633bcfc449380e405ed8b24193c230d69778fbcfd. 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/21e1b73e-40a1-4fe2-baaa-4bc3c30705ae.json and https://artists.proofprofile.net/proofs/artist/21e1b73e-40a1-4fe2-baaa-4bc3c30705ae.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 0x5c69788bbe17153896bd0e15aaffa0f841c71d123d3eeb2ab8327735fa43af01. 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/QZWFP2583055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fc2447cd0f777bc922c175b033ea6bd539d6d7090909d34205c02cb00f7990. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFP2583056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a0a691c7247df6aadedf90e16c98d1c3890ab84cedd57bd3d95c63012eb12f. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFP2583060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ca02865e6a4d44b27421d532f41ca67a8aeef18b16952b43f0a72287efe55f. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWFP2583061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7309e817147b8720c1fc5421bf925faeb87bfe2dd0e03108865727e7b1768b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFP2583062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76dfa4e36e298d4137ddc1a8fc783edd62a54ba5e6914220839d6264e979708. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZWFP2583063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50db742e4430f1d785d7dafe8bc8ad2ed4636be9bb7f07d150f2530d6d7e4520. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZWFP2583064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9232d973dc005ca4f0d1351339e2113edde58f6ce4d507068246dd5f16d477d4. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZWFP2583065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acc589c6c067138705ec2a872496037fc603632d0501f7e2b85ea9c13d8cb89. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFP2583066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60a8586bc293e3062ea8aee1909cb6310733b058f82f6ebd020601c92916184. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFP2583067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d09fc81b9807520295769a3aa4207444fd05c849c1de6f41414f695fc18629. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZWFP2583068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16266b62e114f130eb508358617bfd59607e90e6a9dd6cd7dd38fc24508797bd. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/COC012034092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f83cda30a8bdb8fd684d435356a26a43b8ba1dcb34695d9ed79ce158fbeca1. 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/COC012034093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe971de9cfacecf6639b41e52f5abdcf5eeca03076e1c920879773621240db21c. 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/COC012034094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444511376642b5cb636bda033a498e691080609d4c73187a1b31d539ba1370e2. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/COC012034095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2ab676630b420876a14015b7f35c6709a12b6689496c44487eeca4be24bba5. 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/COC012034096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48462322e6071832d742d97e85cb91fe8eed9460e4a2cafc6880577ff4e26f8b. 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/COC012034097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b5aa647261c7bc59bcc85bf2c384b58e6d67a3eab2e43d5fbb2740cea7b3c9. 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/COC012034098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56fc418ae992f9607e4c9cf7bb55e77e855dbabe19a6b38124a1bd9ac529062. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/COC012034099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf7438942dd77f64ff50cda2c7e9e2e95cd0bff739a1efbd8b9b5df4643b649. 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/COC012034100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc96da6215115459ee806e9be13a811d1d772dfba117abb19f7ded362db3254. 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/COC012034101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6abcd31c9dd0ac4fc0f31e65539eebdd0c4d6ff0b7dafa65bbdd673f2be7344. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/COC012034102.