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 0x2cbc1c1f815e0adefde089e926e9bcfeda07c1517aa8e290d419e6ec6cd588af. 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/742bfe9f-bc63-41a0-9e93-b975f05b1837.json and https://artists.proofprofile.net/proofs/artist/742bfe9f-bc63-41a0-9e93-b975f05b1837.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 0x173e45fe8db0e16470c04df277281828b85fd77deed21675aa0b8b9d593be5ac. 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/QZZEC2320056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce403f0af94081fb21bfe70409f0ac6f4b0f53e161d43fea93d072c8b33af31. 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/QZWDD2359658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d366fbd62863e72f6cbd36763fcd0084ef994463e27f14b7a1f3418c15f3c1. 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/GBRKQ2403580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83ab9110568e6f186161e4cb2ec09a219a54c99cce4b4abb8913a96abc738a3. 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/QZWDD2386665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd50e60a3c6a67579c096c9a33c9df998807baa2bae26904cd2f6cdd356feaab. 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/QZZ8A2488127.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59a7102c2446c9cb13ef8ebab714e9905df9f69c978e9c0d3b2516abe59fbbd. 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/GBWUL2462149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8dc16c027734baadc7044ded36ea293337c407d36e6f4c8c47e2ef7453c10d. 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/GBWUL2533865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd867e8dedaa0def54b1ebc92c2ef32cd6e3d9e97fd403bdf3334fd4d390b8770. 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/QZWV32472826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdec138dea14a33c3b537eb0529169757d133ec55fe2ee06c576cb95044cd474. 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/QZWV32472830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93080555a2044110a9692310beff6472376c42000ed478c2368e7aaa188511e4. 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/GBWUL2477485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9bb876bc9342af4a5db85d652cae9f5b040c160476a1a174877a66295ddbd4. 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/QZWV32419698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf494e28a378ecd86068457c38880e594f069ffff0ecd8015aa4f5240e46fa23e. 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/QZWDE2423466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9125845c96895b3dc02eabe0a1928f32a62d9b29f75ce117f7093835de734b. 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/GBWUL2535317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f601b3b030f4e324dd05ceb0348ce88e32e8d8887c8ea6de1baac66199eb01. 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/GBWUL2535327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f30610bf225eeecfed035632bbc792611e3ecb2788ca8ed21d6ec9133df84c. 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/GBWUL2535346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85cd37cf8f6f4aaaa479f8a4b357181d3d6307b223faae47bb3cedce05db9fb3. 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/QZZ8B2467684.