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 0x08c85396a6b2848d611d7cbbd01e473fa198aef6cd15a68223a61b8e53cbaacb. 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/4654ef38-2858-45c7-abdf-76b84f9e12be.json and https://artists.proofprofile.net/proofs/artist/4654ef38-2858-45c7-abdf-76b84f9e12be.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 0xaaa8f73b72c5ba4beaf80dd07845f27671641c9e926c79789afba31cb2e0883e. Chain 2 (Bitcoin): anchored in block 957644 (2026-07-12T03:18:52Z), 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/US83Z2468196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7a923b102d02c96db5354e5419e8aa2493ac7ac237daf9d86ddd822f43e56a. 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/US83Z2468197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b9274ff09745643e0db72904b070f13ae9685a323080f2c5170611f4131aeb. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/US83Z2468199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82be94d87180649fb49005399051dbd14680656b2f0e9ac833e56cf828dcb5d9. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/US83Z2490108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878d2a3b1d2093e08a401a1d00c0405dc78b617fab13d17eeebd3e4e85982c97. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/US83Z2490109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f79e6f968d1902b149bed4770ed78a8e1427ec5a4bea1f67d0f0ecd29eeb3e. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/GB8KE2422428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46afbe82fc2bc49438419ca9eed4e75679e5012da087f5292e946065fd2ca2e0. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/GB8KE2424809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e3cf1211225223af888edbbffa8d6779e7dfd76a470c7db27f6854ff976ff9. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/GB8KE2426726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46804902110b910668bc5b50d5451c47c7ef16379dc56ca10a11eba0ee0b499. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/GB8KE2503264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ce1ea2ec6a4c8970e2f8bac74743b0aff46ef6fcaf01b5ebc5b77f737dfadf. 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/GB8KE2503266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cfd6ce135bfe45e5be98dcd594f60c0163eec32950249c2d854fa414bb27363. 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/GB8KE2503268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd84427e2ac8babec2a8fe0be6f6cb0a6c664ce31ca10d053fe46e982c1c277d. 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/GB8KE2503269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89067a8de6796eb68ac68877b084cb1434a8ec162ddd5854250230fcb28ebbc. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/GB8KE2512238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241a9d411b12606483125c2c7da6e5410a0baf8314e6d781d2557a27f9dd965f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GB8KE2516940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445686688f710da7633e4b9e3e1afac38426f60fce5bbd6460981789b2a61251. 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/GB8KE2516941.