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 0x71c0505208d98dfe9be5b6d441e3758f875eaa4b83267655c05e24d466e4fcb8. 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/e18cddaf-2f3e-49fe-9232-f3d3aa354be6.json and https://artists.proofprofile.net/proofs/artist/e18cddaf-2f3e-49fe-9232-f3d3aa354be6.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 0xb670d274f69831cd12f4457db0525736bb81e19af6823b0f62d5dceb8a94f8d5. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QMDA62266627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8633c991c39cb35cb59bbc31682aaa25d7b3523cde9356bff17edf38acef700f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNJX2239401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42258a56f732cb67ce607fcbcf2265196f0874202c5453a3b4c04fe38b806366. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZGLS2480024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781f29c00e13aa49b4a7579958401bfeb0fc4024ab3e8fa2ff2d93048203ebaa. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZGLS2480026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41869827fad15db1371ea536234cd75ff1bc1b0af4aba01e8b5845706d684322. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZGLS2480025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3aad7a556b6812a638e40a8912e14e96c64084e7fc454b251ac42a6191a1ee. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZGLS2480027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa036cf0ee287865bd2e387d45acd9ea0ade11c45a719027e7ed7e705fae4c6a1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZGLS2480028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998cc2c4d27933909deae5fdfc330d1b6403c7bfde0eac3ac03a2ee3ca30673b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM4TX2379878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b7c36e96ce5d53f7646dae89f97a4f41d8954fb5b463c898cf43b6728de809. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/QM6P42375268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c80cc365c9e7e95b92d811498a8f9ab1149026a265984de83a697ced14ffd94. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMDA72361959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2efd2bfd3c8c8c2c37ee652a8353da8f70ec416d99b7196d5b4ffda95a516c. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZW9L2319735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ae5f6c52423c2d4c00e69cdbdf36eea0d40de7adcdab932e9a1ff00decb47c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZNJY2409455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2f814685cb97c5de39f4ee4db34869b1241863293d8a54ac2075b0f85de07d. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZW9L2459868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeddf890fdf44d23b67a2f754a9b18fa96aa3f8d4e712c14e03bc50f8c1cef6b6. 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/QMDA72329117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb66f44ed2dcc604b70c3e100b52ed22c481fe1c7ae857a7d921fb7a69765e2b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM4TW2430227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ad4e738de0af387d03e71ae4be9be73c2d2cfe3f50ca079114382d4df56fc3. 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/US7VG2443928.