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 0x9a1a269fac347d24800b0d303476f0b4ad783f5b15ab810a99c2136affc3356f. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1999fb16-2ec5-4cb1-b244-075b2c31b409.json and https://artists.proofprofile.net/proofs/artist/1999fb16-2ec5-4cb1-b244-075b2c31b409.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 0x5be5966873363fbb5fa1fd38c6ea37e8c556fd967a355fae44401ca5ecb20f9e. 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/QZWDW2496757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab5fb7984986fae729e34c91b239066f7a05b56f7ef833b0c040d0e189f0334. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZWDW2496762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d28681d061fd0b77b76ccaa60c1735b4b82091ef8f5fc34573296cfc00d1afb. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZWDW2496763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad18225c27e64ad2c36c557ec25a84e98cdc5046f124ceb091b907f54fd57a86. 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/QZWDW2496765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a973a2821a2d7acbecd029276f1995e4df6a8019626e40dbdf3146de386f5f4. 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/QZWDW2496766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0400997cfbf5a2c29ab7485a771f2b87e88970a461cd3163894d75d61ceebcd3. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZN882518076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12dc0d0efc1e9614b4e1384d6597aaf510e63913486aa6ac274c76b511be9f06. 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/QZN882518077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e958aa8ff5ea5c03ae0c94cf6db842e6f5d0b5de9beb1a8d8930c210133894. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/QZN882518078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ad20a5bda4860f58ced1e9cf5158f26219f0983616077e3d4a3a0d72848b90. 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/QZN882518079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eefb90a8615b7a2c4a033c07381c46d0aa2b4a66cc050ae651dc8559e15776f. 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/QZN882518080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842c0b0f7cdcbf697fea6abf912482a24f73d0f1c1c211d9b68087645970331e. 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/QZWDW2468937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9fa0b694bfebae3f35f6c611a277fd39f141aca16c5aa24f9f69c804b41e16. 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/QZN882597280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da4327bb686ac8bfdfe8372ead5c2588a58bfccf5ce52a01d7ca441852dd865. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDW2518836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304c0c9adb59378e79e96a2c822db2214e6b17b950cd979618b11baad959cdf5. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZWDW2521427.