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 0x9449463ab8c45b3ff2312df1d13fce45c4618f3f65db0282e5bff88a456ccee7. 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/d745533b-1133-4093-8998-4b5f00886dcb.json and https://artists.proofprofile.net/proofs/artist/d745533b-1133-4093-8998-4b5f00886dcb.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 0x9a8e43e3b7a7e9b92cd3dfb29a9c3700bfd6e5795962b69761ca29e96e61e037. 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/QZMHN2241870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe159e5e59aa8c7e859be3c6d99c87e74f413c92eded4547f11ff9b4d77837aaa. 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/UKZGC2301303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8a5397cb42b06b59007debc0e54570ea3590719e7d543641387ef4cf1330b4. 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/QZKDK2111060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8741ccc5a4a7bf454a56bb72d071bdd9375a864a6b68d601fc1fc442da509cc9. 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/QZMHK2058590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc272def482533a2909a7a3b930f0832ec42aa0e1e77da97248ec2eff34a763. 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/QZMHL2008457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8899b67bf70fabbd5c50cac6c25a666e42518cd5c53ee1d7f008daf246bcc742. 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/QZMHL2010127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0b08af8a924057e08f4c3218688626fd753583339fba990e60c5dbd1ed5092. 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/QZFZ21932657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaca1126a177f24208be4ebad140c12e6187e7f386d6e7ed7459b35a2eeb1499. 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/QM42K2094680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8734b0c3de20603136ba7b5c0e89d4ccfaec1969d93a59f3b11f0cd3af1aba17. 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/QZN882205673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dbd0752b5b51d455e387277780ed2b9a257660a4e8593506308376568729ffc. 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/QZN882205675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff195138c55c4e9668ec5330e96540ce7437297375e6f0fccb8c2ffdb25894d. 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/QZES51868097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ae06511bf7438b03b077ceaa69cb586af14f40e95be3229541bf080cedde56. 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/UKZGC2307738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55bc9e2efa46a71289dcd26babcd1ebe519d28a4af11a004077313d715d0c56. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKZGC2307739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb4a3222bed7dc0f720c5c2c919a3cf69afaab7e73ef02c86661148b8c639dc. 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/UKZGC2307740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d765668e71c44c1b8a8e53ba3b0887c9463b65d9b32bb75673c4c2dba81a24. 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/UKZGC2307741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efaaa3663b5b9fd74aa5c0305e53b5eeb9626c56c1d60016d0c923c2500e202. 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/UKZGC2307742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb088e40bf8024efc9e364288b885838922311b2eb2fc13dbc251d3c727654615. 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/QZNWY2337164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea64392311166f7e3fded0e981620c62626b0da541d56f8e5832b4a5db4cded. 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/QZK6J2352593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627f5e4b65903aae252b914695a59dbfc0d2c1ee3ca9cefe1b7d1baf6e88ff05. 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/QZN882236965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44300eded6e65fb987fc855b83053a6f77669254a7f671cd20a1f9cce9f1b0c1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6Q2191459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4405bf4cad106d9d1f8fbeb5611a1e4a3592a6ba434bb1d45f287f0ec9b87f6c. 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/QZHNA2154619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60880058b0aedb7504e2bcc21d18701332c972706a35d75a909df6481488ecfd. 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/QZS632469120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a94c7ca0a50a0603281d0880109945246afcd88079aed5c05d6e36f88c54b5b. 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/QZMHL2515762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06bbf89a43a43d0edd103addd9de62012692fbca20a5daf956a75cf7d4dda057. 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/UKZGC2502725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fd81c94ddd42813042e2af5e8895c28cbc5a2e5999566cb2783670d9b8a655. 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/QT3F22498856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0096319cecd7f99c81d2d18171bd42a490cf3fffada0b1f4bb9c244a690291. 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/QZS672496763.