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 0x17d9e04286554648fb0e5958668838810d1b0edae7180fdaec46a190d124c90b. 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/00056cc8-788d-4820-8f90-a6c32db73233.json and https://artists.proofprofile.net/proofs/artist/00056cc8-788d-4820-8f90-a6c32db73233.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 0x433d91fe5e5cc8cb35e9f695ee71782caf0357ce7032c0135f60a556347ba791. 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/NOAJR2200062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96441956f037563d63741d784297fcc6cda31e3393d0582164d063ccdc137c44. 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/NOUM72300364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed98114c56dbc8f8b672d07008102baa9ff8b7f398c3937b92897272307d7031. 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/NOHLX1970050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa23a6dd33fbd0e1e7783cc32d63d30c32c8dfc2973f4465da556a67c770d2ac. 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/NOQWV2201120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8636a1b0605bf802bc2e2cc13503aa39491fb0fd455baed462036a70314e24b1. 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/NOAJR2200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf21b2906bb5065a5c1f5df47ce79b9a9f9342a02494b45c84ea2661965480d8. 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/NOAJR2100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924381d095e7f89184c066c5f0b808c51f2d9bbb39355bc64b26a74845d15a1a. 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/NOHLX2099010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb73052737a33b5f05dd63ed5f27c91abacbc90f15a57e19a53aa010f2285852. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NOHLX1970070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d88941f46fc4b6ddd27f0a1b9e5aca5f2e2704f93213d4805d9ebca9b0c482. 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/NOAJR1900032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997d3a56155a3e0b8b3667ca2ff8d04701a2f6aae58f1abbc2ca1e7933eed810. 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/NOHLX1985010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbdeb614453a33ef52aa606fb8360312c42e27b0615a878665002a4b4ecc2be. 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/NOHLX1970040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b48b51c77b8c233bacd7bfba5a70af5d77df4e0585cc6eef2b66fb7554bcf8. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:06:28Z), 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/NOHLX1870030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe103a8c8f2b4454e828fddb974c1319ef8c06fbbaaecb882efa98e8ef90a126f. 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/NOHLX1870020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad03048cf91002f1a165194babef28f546c3b6584e8205b2b727069c1535250. 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/NOHLX1870010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0510da26269ddbacee7b00525227d1e7261d934ce4ccbc5e85b8892b05f9d38. 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/NOHLX1754011.