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 0x4ec5b84a4a125288993128bea8470c87a2f9b5489ec6dfd047b8c92267e4dff2. 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/853af2e6-5e27-4b88-889e-f6148c6ea524.json and https://artists.proofprofile.net/proofs/artist/853af2e6-5e27-4b88-889e-f6148c6ea524.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 0xafed81b288fc34030695ba38972fb9b2e738d614a9e7e2233a6c13a4d72bfeea. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/DEWK51800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96054d762a89d96dedbb7084263440b683e9861b7db1909c6a6ab66b4a3af651. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/DEWK51800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2239d7efef04a7353444360a891cdc9e1c8f746abcedc04ad47d9f2971a35404. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEQ920900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a1aacffd3e699efaa4ca3e8b0d8fa51a253f174382152b8bf4570b79cbef99. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/DEQ920900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcff78a3ec45e4ec371f83eabfa7b458ed2c2bca3e0a5fc81b747200976432ab. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEWK51700112.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc4d6aebe984413880b620b3b0acf96cf1acc3de198c75d3d2aec4cd0d3be55. 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/DEE820100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6901604dfdeb23b657849138fa610c5a448ce0b7e30310fc831140de0c96131. 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/DEZ990200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6901604dfdeb23b657849138fa610c5a448ce0b7e30310fc831140de0c96131. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEZ990200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bfbdebd91181b6fb61db14c1f6d9d2d0b4f7f88af2b307c6276bfe91824695. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NZRN01200039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93567979ab096a56d49588a077a13c9610527fabacc4c0e15a5d934b7861270d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEG930900942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7932e72197cc088d83e275610b81bb00ff428250a384d0c61456f31f89536018. 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/FRR640990006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9898765d387265ec5e3e762e67ca8a657fbfd321aa307afb2d50e3d890c6e16f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DEZ990600151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb6f1ba8ca39509b11cf4a3f4d0f08ef02b5b4d6528a517ba3c7e79ec8b717a. 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/DEQ920900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae739d0ed5d065d58cb3432d0410cd8400d5fe05159a1793e69d67938b424a2. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM6MZ2444026.