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 0x81d2266481a4c9950f11ea2db5fdab29b53e8460f13d77ff4876c71582c29ed0. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a15d7581-ce30-403e-aa43-824c4fd58067.json and https://artists.proofprofile.net/proofs/artist/a15d7581-ce30-403e-aa43-824c4fd58067.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 0x0a0130a07e7691f4a065198d8d53e186d8b86ca55e4f6e14dc5aa827286ce989. 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/DKNA22007902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf4507da779d9958c5557ec614f06004370605ace0822a2848801e5f89ff63b. 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/DKNA22007908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6387ef4d8a601cce4ec2dc9325401a5415146048ac2f437032b2380ce373fa1. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DKNA21803616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73dde204ea23fd6da70273b783f2b8a139a398a5d7fd804c2cf8d66f5bdf884b. 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/DKPNH9700701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99cd6d9832d0235a653f52127a9eeddaa2acaa5bbc2edf118b05a448e1c6544d. 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/DKPNH9700702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f5b29f53e4824710abc8d8753cae47a71edee404f0845aca7a6189d3f0d6fc. 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/DKPNH9700704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b392453fc0662f4e66a514d42b69762145085f25121e1d3fa023bf6e31429a5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DKPNH9700706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cf2962027f04f1eae13ac8b1840b4a28455c82dbe25d9a336ad5a8e2872696. 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/DKPNH9700708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44293df2fb011144b73bdd3ec21e830371014fc1f9a30088cef50d22016a9b1. 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/DKPNH9700711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b0c980cf4e8183a4583042d69f82df88ab67875d2c9bc7b5b5077abdb4d60c. 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/DKPNH9700714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6eabd3f50b1d8b4279fcf29f625046d5679ad9734f9174bfb42f0e67276d6e2. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DKPNH9700716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605ba804d608267556133b60d95912a321ef43077bb606a1620fc2ba12210b78. 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/DKPNH9700717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99c1462cc17dc744288d2d77bc628a9c517856edc4d6feaa3581c9ee08b96c2. 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/DKPNH9700718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd092e42d3a0c9b6c920f75a92029ebdc43d9679a5675a0d9094e99b8d63961ea. 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/DKPNH9700720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff87b2fb36e33f462501724f3cf040f5b545f435270d4a98f670065e74e2970. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/DKPNH9700722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f973defcad747f949762ab1335f9e5ad0b8e8b73130d963d91f10f9de88357c. 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/DKPNH9700723.