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 0x3ada69836ddf8098e304951fb774906a96ae473bec6f23adfc0057c1d3b587d0. Chain 2 (Bitcoin): anchored in block 953954 (2026-06-16T14:18:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/253a0518-86ff-44f3-bf39-0117c383cb04.json and https://artists.proofprofile.net/proofs/artist/253a0518-86ff-44f3-bf39-0117c383cb04.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 0x9fe3c589c78f3c33d47cc7b72fa5925f0ad51f6a86a985405bafe0ce160b1b58. 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/TWA750300501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455539c5ca8fb66f3f1a37f83ba09155b54105c391348039ea9d1d712dc5a371. 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/TWA750100302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7761ed3973337580ecc233314a328a080acabe19dbe36c9f452fac82cf780e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TWA119300401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80350c1eee327d051214c9f5b77f97f16ae67d38797607f4f3ecb4ad5bc4b3f3. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TWA559404101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d711d3c14b01f3d5f8d1286f02b01b053e97911e15154eb0d021a11fc3e9a6. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/TWA750100303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13acc9be42d057b59cae7dbb12cdc313267190674d0f9c4b69580431ce9569f7. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TWA750100301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455539c5ca8fb66f3f1a37f83ba09155b54105c391348039ea9d1d712dc5a371. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWA750100302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe698e7f344e523ec64e47540fe8d9ebf5878072d3aad9803b0132eef3f6f8616. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/TWA119001403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x455539c5ca8fb66f3f1a37f83ba09155b54105c391348039ea9d1d712dc5a371. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TWA750100302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d942c91b2f754711519026002b405c0479677f6dd7d3611363056350eed1d1. 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/TWB779718011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89c491c5138b9168cf28fbb6470ff354bc35d2dcc69e1381901aa166def81a3. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/HKD450200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18415357c94749463d218de77817109a535ceb58af7e334c33a1d3760df38543. 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/TWA750100305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04dc050d040be0e439e83493a663f96444044df5af2d6c8c45a799518d002249. 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/TWA750100308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff5f23338417f939cd74ed69e1fe8683fc329b2b9681af47ad668da5cca73a9. 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/TWA750100312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d711d3c14b01f3d5f8d1286f02b01b053e97911e15154eb0d021a11fc3e9a6. 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/TWA750100303.