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 0x5821aef89c55fa85659f7ea9b501058fcb2e2e0ee4a567d700e914b3f10d1635. 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/1b81ea69-ea46-41cc-bd12-8d98ea1fa717.json and https://artists.proofprofile.net/proofs/artist/1b81ea69-ea46-41cc-bd12-8d98ea1fa717.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 0xffdea578d1376a18c4fc7f7a33946d9b060defbc49ca7ea341131f304e61c9fd. 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/QMFMG2343728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc431fdd46fd227ba1696b967424ce1c05ceb67b58b4a78f592ff55700614fc51. 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/QMFMG2343729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ab910af40eb2284dbbd70752a718e2d9650bc4046bab5af9546ef56c9104f3. 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/QMFMG2343730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6347a8d52fbebd4fe039af23d86c8ccd068484255b0837698c79de2b39aaca79. 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/QMFMG2343731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41b5fc5f65fcd14442ed733a19366c40c5ea30ce956f5dffa1e8afac3eb39db. 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/QMFMG2343732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf660019dde6c610fbc034e82ef7358173f6ae6466e75d872c24df49d422a8565. 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/QMFMG2343733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3d70a41a334259b774efab6ced574504dfb84065b6d31b2c1949718bff90bb. 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/QMFMG2343734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056655df0b7489c7876d7e1a047e870f908ed86f9e34174bf6f13585441eb3d4. 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/QMBZ92135672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef7c069661ae1a256c22dd1b7adfad28c47d28cc8700561d5f04bfa3f24d52f. 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/QMBZ92135673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831a761052b072f820eaa2db00ac96b14704829f45c2d1321e0adaa1436d2db1. 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/QMBZ92135674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15ffc5e014684b2783d7cac97667317ab2ff974569e02037dd50758bda86ef0. 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/QMBZ92135675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f339f8bce5562e675180e2fca95a8153d461d879372dd397887585a77b74f13. 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/QMBZ92135676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb04a72a045744b3ea92e599ffe97419af2c763929dcdc6e88358c3d9bdd8ceb. 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/QMBZ92135677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb4d80c49c1d65692a5eb2249413a8c9706ce36175185097beb0bcf751459a2. 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/QMBZ92135678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6347a8d52fbebd4fe039af23d86c8ccd068484255b0837698c79de2b39aaca79. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QMFMG2343731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf660019dde6c610fbc034e82ef7358173f6ae6466e75d872c24df49d422a8565. 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/QMFMG2343733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ab910af40eb2284dbbd70752a718e2d9650bc4046bab5af9546ef56c9104f3. 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/QMFMG2343730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ab910af40eb2284dbbd70752a718e2d9650bc4046bab5af9546ef56c9104f3. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QMFMG2343730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15ffc5e014684b2783d7cac97667317ab2ff974569e02037dd50758bda86ef0. 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/QMBZ92135675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef7c069661ae1a256c22dd1b7adfad28c47d28cc8700561d5f04bfa3f24d52f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QMBZ92135673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056655df0b7489c7876d7e1a047e870f908ed86f9e34174bf6f13585441eb3d4. 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/QMBZ92135672.