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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 0x67af7bd40d39d344ad8867caaf1c4589e6406961162e8d120e82cf6526c99dd5. Chain 2 (Bitcoin): anchored in block 953707 (2026-06-14T23:22:21Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7da843dc-cddc-47d2-ac42-11617b45b859.json and https://artists.proofprofile.net/proofs/artist/7da843dc-cddc-47d2-ac42-11617b45b859.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 0x55683136fdfa53af81e6ef5e96ffb7b327b3c45c27c5628894d1e45954fcfce8. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/TCADA1731003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e869590a67c30633277e9e0871d84aa5ddf47048c2aee1c30bb88e446f987cc. 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/TCADS1802937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e8f2d3a2598312270d609b1af00def05d49c7a7a3bced69fa9063976a37968. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TCADS1802950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b86e6e7674c39fc813559e21ffbc32e847df1d2cb704b4df9a280cac1f3eef5. 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/TCADS1802956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505786f7c0eb4dd42722d96145e59bc3965de9eff858516676c1604ec0cd658d. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/TCADS1802957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c259554b4b7a2de8469b69af2aae6adaf52f172f590ee08bbc1f35102fd93e. 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/TCADS1802975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ecaa83bc3861859586ebf9bcff0712326b667a51c52253575adebef5730620b. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/TCADS1802989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6e58eff8a29c5ce7c0eff23318befdd74a57fa5d8a92e51020420f06a39a24. 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/ITM631800801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3907487e769c16aaf4f2ff571bad750be00907e8e776384fdfde954881ee02db. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZHN61980804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca0fb34bb456880456b39a326e49e3b9282d42bd35179478c76f945cfee72eb. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZDA82003067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7eceb2a02e0ef8b27afba185d9937559416528b1ea6179828af7ad9304119a. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/DGA052061999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7eceb2a02e0ef8b27afba185d9937559416528b1ea6179828af7ad9304119a. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DGA052061999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25239251c5207faf0ff4140b0355c8c983823b28214172f917aa497c9c1fc852. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FRX282192957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0bae3a43344bd3f258963b70da8d8dfd4cbe3caaa7d4d6c3e4ebc65a9109fe. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZTAT2129447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5b5275acc22ea7120ebd5309af116d114298e0994425affcd116ed37465dc5. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZES92584788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee90ef23ed9bf604101fe0739ad3fee3cbdf83734f1ea7eab9ac765e477d945. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZWFM2526595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90154decb626c6ffaa8c2181e5a04035b3d054a998fa55a3175572cc072e1209. 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/IT7LD2500715.