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 0x0b1922917ce1d2df133e7a411e9f04d6c70289fe682d8b8aad404eb3fb845418. 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/409d5870-00ec-4052-9659-6314dde4e288.json and https://artists.proofprofile.net/proofs/artist/409d5870-00ec-4052-9659-6314dde4e288.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 0xde40e0ede30dd6f0309f2b69137ffacad5fbdd52f975a8908bbb2f30b63727bd. 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/TWA472301001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb25afc124d0af516128f328627035be5d8b3742be678bae79651c31095a7b94. 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/TWA472301002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063f319a75ddee7eee1ed7b851a7a024b3e82ffd32cf770394848b81480390a6. 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/TWA472301003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e095169c2bab812180d53d42420ae76460c2f053773b412013f0d89ff3cb27. 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/HKA412200175.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71adb5d22c68b1e71edd7e6bdf8ccec37615eae8232a192cca1d506c7bd55ed7. 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/HKA821600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bbd098c9681ebee9078cf54f1cb44f4e9a2d8a9060cf368b07c11fa17eb053e. 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/HKA412500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599d2668d848b6c87191fb875296649195f5d198540d0c2aebc976f4829fa877. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/HKA412500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb430d119c20d8077ff94374f15f409a761f40c2293d482c0c7702dd863993d91. 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/HKA412500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3723d65c8405149750d82774d79e6dca41c67b8fc52a4f3e5843c6c348f403d. 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/HKA412400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7be6148075712edc5f79c7d3160b6e832d2a966e74530edf86c153d378dbd45. 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/HKA412300693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0e40105606f69def885cf9b4fc66dbf5fd3e55d9b7cc40e20f5ef27ad5ce2d. 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/HKA412200152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074131ff7769466e9f0fe994e1a17bfe76c6913cac01f60e56d709d68281b133. 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/HKA412200057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc221c9d9a098db51661c5fd7678630834afa5a92756eddd2883594bdeafcbe59. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/HKA412200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4665edae9988e7ff978a2ad78aa2efdfca146bdfe27fd79f1cda0599513a38. 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/HKA412200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59717396b18b8269ec916d3a63dc04ab24a176ef5b4226cedde3c056caab5f7e. 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/HKA412100161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2c46bbcdcac978a61df5207d7529a36bef50904921ad86ed7b8009c0387129. 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/HKA412100052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833536a1c36684626a3ef18eb611178f0b8f31e60af047039f13a0e746c74167. 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/HKC492000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34bc89c8c98b60debaf9be71ee32ce79c09c7b5de633d063edc43ba2c8e36503. 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/HKH041900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183ac8c31c52415412f6094d1ff13475a1ef27cfa40e791863fb4ac00c1b4d71. 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/HKH041900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b76db3e08cc212abe3dd1507dea268b2c9ad625b39840d824c6d8acc87fa44. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKH041900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397050b88f00b91556d5495667e4fae0d3e9f2dc887fb76e543840cd0b6e37d1. 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/HKH041800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95658130807f2751704e8a30ae7438974bf26028ff51695ec9d59b9bf4c3a86. 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/HKH041700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1471128209bb5e862004b7234d27672ee2b56ce42d037225802da1dc180e8c82. 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/HKA412400387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6df401395c77a3eeb9a8d0fe1f53b94ea208bc726d69d1cf395b9423fc4594c. 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/HKA412400390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb430d119c20d8077ff94374f15f409a761f40c2293d482c0c7702dd863993d91. 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/HKA412500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa652eca616b0c9bf8f97741fb89614b670a32537c9b7cb0464fffba8edb4532f. 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/HKA412500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1ef07a4d1cb36db1e92e29e03a6eadd51d247b17c18dda2257e2d2ec841b0a. 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/HKA412500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2838cf11cdb8fda7b1f0f7e9979df29aa34bf619d005b247700af38839ea31d9. 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/HKA412500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece10d5418b27de2de79ae6d2e0802609277a36463f532695f9c1a48a27e3db4. 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/HKA412500019.