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 0x43940a63165acd7f4d7a76e30f37d041b473724c2c97a2d1deaa21401eb78fa8. 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/3bddf1b5-0aec-432a-82a8-aad5801636f7.json and https://artists.proofprofile.net/proofs/artist/3bddf1b5-0aec-432a-82a8-aad5801636f7.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 0x433af01d293f1626e5386e1091280a778876ba8a657a33a10b7a4027d80f4c13. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/NL4NL2147674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433af01d293f1626e5386e1091280a778876ba8a657a33a10b7a4027d80f4c13. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/NL4NL2147674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea27a0792a978eea1801560e592e21c01468c6273c75dde6375dc6f8f32e197e. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/NL4NL2147676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f638933d2a8eead29f027d6b116b24f46334377bf6edd714b60fb4a5f2b99ce. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/FR9W12221408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ed8e6e7b5ebbc6358e55a389551b175339be0fb55c1f6b7f6ed342c309d45d. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FRR642300848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b5d3484c82cf119a883897bc75d48db66b33fcab2c80d16822a7b70986e06b. 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/FRP622401130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d877fcd61ca3ad0af27b3e212c2ed876f05687f140f857cebe604a533bf239. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FRP622401180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5902ee5f7e607818c547c6d4fab6b494df7917fee16154d34d1370f84a380e3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FRP622401190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac1d59586836f037a702a76b09395c7df367f50fde3ee70abd45aa3b48623fa. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/FRP622401170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5be72c7a53c94256bcef8d67363b96a67b2b075f78f45b3e41da88668f8fc89. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/FRP622401150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69484d60d4eb4615a6e64213a13bd0d86eb549a772cfc08d26cf032fca9cefe. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/FRP622402000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c1ba84c40eade0a84c9b5f2ec823b8f9eb654a9da267619775195273aefcbe. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/FRP622402010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445e3d5ecd9beab2dd15ef614fef17d5e91c6cde66d4f57e584c4de7cfe3752d. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/FRP622402020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b5d3484c82cf119a883897bc75d48db66b33fcab2c80d16822a7b70986e06b. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/FRP622401130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccafcc6504a8a9fe957b5b941a58027671952b0a8d09790281162db0510d4c66. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FRP622402040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9f20a3b9216301a253a0b833048e5ec20de14f7288979aabdda812dd0f70c7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FRP622402050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753ed326e96aa2dfa3da2a2d7edf100c8e4988656df4c5c6d633cd9f21a20e27. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRPZ92541690.