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 0xdd4bf5d62291928ffa08d68f5c4640391789ce6b38c66e4ac26711ad27ea8277. Chain 2 (Bitcoin): anchored in block 953923 (2026-06-16T09:51:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ca3a32f-b8b0-4925-b2e5-cafc5915d188.json and https://artists.proofprofile.net/proofs/artist/1ca3a32f-b8b0-4925-b2e5-cafc5915d188.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 0x7e79881bc9ed7f7f5eb22fc9e0e2c0740a10febaa1173c970e2453d6420dbdfa. 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/TCAGM2261820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d18c526c0ef25fc821ef3d5a4291080d7df522f16683b936d0d6f9824f6db2. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/QZW9K2312374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44485e1e2e08715d2cc53bb5df5eed18737641e62e6b4722de96a9704cbb1022. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZW9K2312375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf5e6d6b5ce6e13064fe204cf260acf90378ea64c4f205f33756c6f65146465. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZW9K2312376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b62a1b61c0accff33891e12bb6ef196f589e94e2f758be9f5490eb90befa8e2. 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/QZW9K2312377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13af54a00ed3eaeea3871715a3af608c61f73a28773293b6fdb1118199e9250. 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/QZW9K2312378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07f8feb378c6c73fa26148ebf960a498d143c1471d9c7ccfa81688f056e7eba. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZW9K2312379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76eb36217609446090bec9782a1eb07e9944ea9a03a98903e34f036016f1be2a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZNJX2342598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca08f74d473d543ee84114b71beafa85db84e51c7e5f4e6d0e36941ca3404d1c. 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/QM6N22413336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca03477980de04bd614bbef76d6e095c4f0ce67781f72954c0d9819e8dd1704. 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/QM6P42594929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85d1425959d8cd210c42b5866814fe37d09fb8b35c4d4efa02610f6256d5bd9. 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/QM6P42532256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0355b6b9c90a2abea685ecb8858047200eb9084242e0834e08bbc2729bc446dd. 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/QM6MZ2514837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55081798d3967a47e9e7cc6c29d3e0d2a8aeaa22f635707d98b91f1c94c54f4e. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/AUGBT2401304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2194ef375f64b8c6bf3e199c5a3d6a5a7c0c4ff83d41f597ef1ceed5326d5d3. 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/QM6P42404145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289c6e765bac6b498426e06fef8515eb38cc812ddcbbd8da3cd6d33f2a1c36f7. 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/QM4TW2433832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39222c8d324801c74094817b29a4a4859747f6fcb61e5937d040138b9d53dc3. 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/USHM92560802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f2f9d71428cd24c165a3d88e00a257b5e52363fe3691adb3115d354999244f. 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/QZNJX2558431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaceaf0faf412f83bebc92fd757b0678ac29dde944c1337ce0d4704d367e2f4fe. 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/QZWFL2595839.