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 0xafcd80e6701155af1cd2f068d1f83603e5cb9cbd52adaf0551219da26fdb3e97. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a27beb1-e2f6-4820-a5a9-4df2e503c578.json and https://artists.proofprofile.net/proofs/artist/6a27beb1-e2f6-4820-a5a9-4df2e503c578.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 0xe678d47548dee5d39feab4df1abb4b856034163d15b1a7a07c198eb94c81618e. 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/GBCYY1100463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e1c8195444f59225b21ead123bf71924ad964412f7d6d59e19688601ee2d65. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBCYY1100460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bfeff1d621fb2ae2d7639e13455a941b2608c38aa229010b3b67d2eb6ab992. 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/GBCYY1100469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98541f41b5d84ef7afa6b7975a4c0fd49b83e4fb35c3e50eae1688cccc8242fa. 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/GBCYY1100445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2901221d39476cd286cae9c44448fe825b89ba7e28f110510c812212e4020753. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR9W12019863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc912b558370b8b6a23bf08f9c1d28bbbfe4b08a2582d40c48a76c093b2d04dfd. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/FR9W11512799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce684646829d4fa7d317eeb8452eee6d6145f03162a02249e3a40ff30a9295f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FR9W12019870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39c8a2ceac2bba96885ca8131b0081bdad4b9376c223bc740b18aaad2b44ab7. 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/FR9W12019864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x257c146a4088a03282307d4b7e6a449282f403ecf176ed5a259e09e6d8d3cd9f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR9W11504153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8167c80e71ce1e50268bd2001b70a95780028031865c019b71d5da1ff22fcebc. 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/FR9W11504154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d7d74a58d50642ace1114a49ec974bd3a79a966d1155a2786a242ffe82a8e1f. 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/FR9W11504155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6251e3eea8d95eb23e91c09ec6d134bb4291c20e7947ac1ab2bf0789621352. 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/FR9W11504156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd5a8f2806a2d37890e8880a81af9636db4cd46b2097d2f03e11c83722c2248. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FR9W11504157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2547b35d71795b4b8eb90e7fb6755db266ea9a31ad7837090fd952df56e2df54. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FR9W11504158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69849ebbc6e64eca310b0262cc8d21839a2241665542d32e0a843065235cdaad. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FR9W11504159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6618adf5fda18be44428a804d2c5181d34328f672e4a3d44c9261354fc2916e8. 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/FR9W11512790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe892d5411582ad9514da0aadce41ae4e843b498c629644fc64246c4afd207577. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FR9W11512793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bf7aa3f2223075ccea71ed0dfa6110421c9063a51f63f287ed22014c502ead. 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/FR9W11512798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09f36fd4a937eef79a85977140592dabdacccfb8dfcf998781f4dff03408c8c. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/FR9W11512802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b60b3234a19cc1bddf1ca176f4c55433e45183c9a3703ca9d0667c0eadae77a. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FR9W11512800.