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 0x5e446ef1430b592836699361de372111d16b4bfdef527702c73ede8abcff5621. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1b2eacc2-c714-4ba6-90eb-a19b06f3a8b6.json and https://artists.proofprofile.net/proofs/artist/1b2eacc2-c714-4ba6-90eb-a19b06f3a8b6.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 0x57b0595590e29d73e431ae4b640febfa8659d16ca4a118deee639d478859985e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3EY2410335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd4799c8c32f8d62c0b5d6611a967d4bd50a5ae252062490cae23f337299dd5. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QT3EY2410336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa3cf20e002a00aef1a3f72249fc4f0ffa65fd4043c78d48e59c1f837f51daad. 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/QT3EY2410337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e046bfdfa2006015a2c562904adaa431d693ec587bcab4992cab351cc36289. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3EY2410338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00fb0d80cb57eb9b1d3133197558afdc9b9e674a14b8fcf718a17fb59beb82d. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QT3EY2410339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86b342a9006087e99de87ce369d77d1e604de5ec66ffc0f4bf15aed9aab6aff. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QT3EY2410340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba38f3a3affd4e66cafdb6942ed3a43efc1f986a76afea8f0b26020383b4a41. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QT3EY2410341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff2af4b7fd95755bb0d88959e5c97c5ae50c75f5fec55ad9f535b6b1551168f. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QT3EY2410342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05df586ceac330f305102b849d3d6666b7ddcdd941e45a67c46fbb216b0e653c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QT3EY2410343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b10b0e04f2540f83002226d49e89cd8b6f5b5b5ba61158c06942de83d91b122. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QT3EY2410344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7737107ad0b2c2ace2ae0367e7402bfa65f6eb51605c0790c7f507ea55f019. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT3EY2410345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d829ac5c26ce7445516cc10bc126b00ddac87f5e05415af4d638d0d2a6fe7b. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QT3EY2410346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3f1c274ab7feaaf13811c343c7d3f6e2b5f49e71ecc93bdc608515e06b9759. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QT3EY2410347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1756d04b86244a662b553737bf5af4dfe1803e2a4b4723beaa7f059c30d28d21. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QT3EY2410348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54da29c255f5878b762649138c484fcfc6b504dcb931c81b28da0a46b2caad2f. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QT3EY2410349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8880460f5e9b1bf5ac4077864ee3bdc63d0e5bc2063aafb8c809ed2d7eada4af. 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/QT3EY2410350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b394bb6fc2a3f4505e45af3a6875f807c9b7080dddede9a2bb17948bedf997. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/QT3EY2410351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c39fde47bbe4b972b1d414e3bc164b22359db372eb804ceb73c55e3dc09c0e0. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QT3EY2410352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1973263fa8460f2534442166ef04dabc3e1de91cb415e9b8d87d71a7263b1282. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QT3EY2410353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb763b504a13de033c3bc6524f92565a1f57973e22b1e1129b93b488e749674f. 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/QT3EY2410354.