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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 0xe3d9f6a1020b08bbb692171fbfed3081614cb831010e25ae08d1ac3dd3e87afe. 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/bf147790-6d69-4acc-b492-7b3d8ad179b3.json and https://artists.proofprofile.net/proofs/artist/bf147790-6d69-4acc-b492-7b3d8ad179b3.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 0x16a7d8e770797724dfa37820613e011c85c9600f4f7b2917c143784052155caf. 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/GX5MY2356731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c310608a76f49c49279263df966730a176657b0abf10ad71200932b6f37363. 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/GX5MY2361320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8048b97927f9d69f1a4394ffd809d4640a5715d17b6e5020f19c14b66a80651. 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/GX5MY2373619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cce89bc18d796fb7cb68b4f20f658b8d81b49510de6cf81ca8270de20b72751. 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/GX5MY2324433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e13e5f789d9d9c45d3058ac4269c6c1f195d9e67d0a0051ebd4316a219487c3. 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/GX5MY2312274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba78664d7b68b1dac755ed4e8308191083cf59e4b4352318d06786e9e36ed56. 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/GX5MY2324781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d454a02f9a17aa21140082e1e6629a0f74a1c47ef8f687748869ae94c03d69c. 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/GX5MY2367289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e3d33eec84d14f47dea91afa419e00c14363342d804fdad17b64fdb38eff16. 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/GX5MY2386154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82eadb350969fa8b2e1a106d653396c9a34746762a12d14a4c3f8b19d3137ec2. 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/GX5MY2368621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe6c70d3d04130e88a72d2894f8afc4e44e7446c714b017e6f8a6e7ca35f6ba. 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/USL4Q2448125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc942840fc837b45a2b6ae55ac0af0f122a0749ae92584ce74f0bea60a005419d. 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/SE6I32404978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19d2db76875c14a9f89726d4cc62202d81f37662a9865be7fae0036aa518b54. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SE6HN2452629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe938288ebfb583ad5a7f33a450f9223a7abfa9b8b4783a1541fe9e8d56a97627. 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/SE6HN2403870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfabb853ce21a467907a90fcced08a8cf2af046dfd71abac83539b4f0be59c9. 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/GX8LE2409799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910166def5a1f0151dafb7904b25417c20196871a03e7129acfb67dfddf41e09. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USCGJ2436205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea90ea56bfb6224eb719af1133ccf84a64179ea7a31b9469a2bbf33903b5768. 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/USDY42471611.