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 0x676ad84925e2571fa8d7566d3c9744dc722bc19306a1a3debaf019b05f8d7cf1. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f463624f-f004-4b0e-8718-ddb3e59a3061.json and https://artists.proofprofile.net/proofs/artist/f463624f-f004-4b0e-8718-ddb3e59a3061.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 0xe6114c54bc4a9fd47a37bb7c3facc0a08eac64fc2bc9ad6bc10622109ea1555a. 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/FR9W12335051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c0d337931b3e91b5eb0de133f445bb9503f3b77db86c18c94558e0be7d0b2a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR9W12335061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f46faedfc34771387eca3ee3acf45421ebb1cdf311ad04b9bd19ae429bcbdcf. 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/FR9W12335052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e9cd13dfdd58a72251881f4e0a6f1b479711eee91113bd7d463bcf6e40ded3. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FR9W12335062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640a83fb2fcf191bb11def1b82a3772a3cfe789b4395f838861facd32ae0ece4. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/FR9W12335053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a7a017b58de08e9ad96a81ee8f48fb6d9fbbda5b5f14a8fd089f9799956c96. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FR9W12335063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa577fae439a29132169686dc0538a1f26418a4fa672f5edec456119ee1c4b200. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9W12335054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1359a4247a5bcb2e394da646cb70248c0042572ab1f6195d67dc9f6add4c59. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FR9W12335064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573144645033b578950687145a8df7c10855a1fab824450ad214dce4a6fa7ed1. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/FR9W12335055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf50883837c0bbbd29fe724d72faa56086c0b76b0baf3ce0533c5b9533cd9db4. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/FR9W12335065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67a531fb72c70a5815fa812f6aa83c935a1f4d352f6059aad32280aca1e2f76. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/FR9W12335056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811ca55cb4fa876331a607e5054a8c6f09803405ad29e42c273d931edba10af3. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/FR9W12335066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6580d0737eef9beb07f53fe349315dc636bd721860f13038beeeab2f58b817ff. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/FR9W12335057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b801a5031a278e114e092afb176e1c35ef8eb3ee66af4f15f53143762aabbd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR9W12335067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac307243026d367fa50791c36d1e17bacdc08afb7a49ad6539555bfb30b0da8. 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/FR9W12335058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d112ab7d5c0234b036e4da63fe7b3243969e8b8caf4d7d692bff2df0718191. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR9W12335059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654c1e2ad175727a74dabd1817d801ac79634f530a42a6ac1e22dfac71620773. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/FR9W12335060.