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 0x5b7e91173cf1458dc5d9fcd437d6e17e92494e114ee1d143587be62347564e4a. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/92a7d635-d900-4094-a050-7cf98b1b4590.json and https://artists.proofprofile.net/proofs/artist/92a7d635-d900-4094-a050-7cf98b1b4590.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 0xfc32b3f7ddb6bab16da56e11b5f2e0b763924b13be2f0c8fe7917cc241c985bf. 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/USLZJ2312509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fe5ee6de8ae1992dd0c0995aa532564748ed1a7ca24df2b21418315e745072. 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/USLZJ2312515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f7582b804a3c84405c9b28256e8589d666b99b4707aee32a130f92538ec221. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USLZJ2312543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89811b23004e3610388a2454ec43bd098be3c355b8888dc70a0e88a399d3278e. 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/USLZJ2312565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a19eb527b80f69977e193c951cbd4c7be15d71be3d93638f09ebf0f4ac6e5e2. 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/QZMZ92248470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf353ee0c121d54275e82c8f9030b1d5825840165fc2921261c88eb18b0f5a0f. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZMZ92248471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012a03e3cd73f6fd2e4314b2f2e83228a21c304ee2fd85c70b46a977cb34547b. 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/QZMZ92248472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca08132a6324bd848fb3fd358f3235a0b89a6f5e52decb68e901dd9d34578fc2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZMZ92248473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dfec57940a38c1e87c89837df58de68168cf323252e549913615bcbd186b4f0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZMZ92248474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae0eeac835931f03115ce85a351509d720e8d146c4b54fb69f0df421d780b88. 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/QZMZ92248477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e7057d40d867e80beadd75f1fdaaad9108233800d1bc5e874979f635eefeca. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZMZ92248480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7106adb782224a7826f76ef38ed7223584336c6f45e5633e155eddab27aa91b7. 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/QZHZ32298340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef50e4d1ab5d3982cdebb2905ed7c50b410f9282773381dbe91465720159cf80. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHZ32298341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4468a79d14903c5b30d5d3c8a6e3e4de5c846ae5d51624c564d2aa1607e7be2. 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/QZHZ32298342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7f2ad21f1d4ff0419fb6513ccb3cb6b2ef1f81593dbf52f80c92555c4c9426. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZHZ32298343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e206e361fb3b967087ed87fe5f56fd1f02f6261dbb22ef5e26fa6c803a2764. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZHZ32298345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceff3c53791c84a75620fa742a71ac23242394435d67d67c57cdb57d3223cb29. 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/QZHZ32298346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd03b2ca0c98ce4aada5d72d1866d7d640f169965a26df3ee63111b75b10117. 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/QZHZ32298347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9634858098959a7033c602cd61626431ece08db7593899adda0efed69c00db1. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZHZ32298349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840c2cb003a575dcaf5f7462334bc48adba4e2ec4da2594cb8e54893e0f13435. 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/QZHZ32298350.