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 0x289a39c3936e5bdf29bfd1fb2e0f9b60faf9e6b0dc33d1dc9924209afaab3ef9. Chain 2 (Bitcoin): anchored in block 953886 (2026-06-16T04:37:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ccebf30-a9da-434e-894e-8625c851277a.json and https://artists.proofprofile.net/proofs/artist/0ccebf30-a9da-434e-894e-8625c851277a.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 0xf7aec6208f354e6879349e6e9d94bf20b95cd8d84fab4c170458424d14a8065d. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/HKE022234630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3859b19e3345e9594e642ddecc2ef41f0e87bca3487a4865b07e33e290d118b3. 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/HKE022234631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe714a348d67ffd5c6c92566efa96912b364f21e1430218b50fcbad167f285800. 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/HKE022234770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d02c1cc45978c3f2e03fe808eb0f82eed05c9b2130fa45a6da49d17b72ee05. 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/HKE022234771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444f90bea8b439fb22316389a8e2ed59a0a9ab68c84d2e9e0b185918f824317f. 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/HKE022234772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7af75a8d3c36ee1a8b61a4ada70086cd898e160947f55c97fa21968058d155. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/HKE022234773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5072d392988bf1f5e7512a6e2551b1b56af1b1d7841665e71a7c4955718538c. 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/HKE022234774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5c6507bbac44d1120c1665d92b61b5d6f6dac05347db704d93f932477e242f. 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/HKE022234775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400041e1ff8782f7e21fd9daf914053d776710a8a7ab7b4c4b0ac418693ff9b5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HKG732368829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d490f7a667b79fea5842fd7ed0ad575abe0a0f4ab353bb6a824db7c99ec8235. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/HKG732368834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55767663ecfc7a42d1efa3cbd843197ee4f44d08250d9e0b0c19c9f460e6e91c. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TWU712400773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacbdacc816d0ae0626c0458cbf633acfe961ae380d8bb911bcc165cbc19a845. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CNZ852205420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc352a1d6577451c070b2ecb1971479fb573ed66319d55fc900e5241c0e673608. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/HKG732429530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b6f954d3b09cada70a2a38d9eaaef34a76d93fae1206675111ee0f2deb11ab. 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/QZFYX2176154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658eb9569c44af162809591ea976f0100265b18018f6c16bf501ef2b85da4cba. 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/QZES62091553.