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 0xe308576c05ee166ce7df1bd10b20b0f97433ac7103b27e033d8990097b6e6d94. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4565c592-0510-4d4d-87df-412b80ec78d1.json and https://artists.proofprofile.net/proofs/artist/4565c592-0510-4d4d-87df-412b80ec78d1.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 0x4083a76a22577faf40c01d07b0130563697d31afa025e8474490c89ff37d61bd. 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/USA560458720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee346b6c12c5d891cc28897d01cfe016d95eac374e6fca740f976c5bc7224e8. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USA560458721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eaf608971d387d8aaa53d708a01bb68c0299735fa4695d7ca0656256978de0d. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USA560458723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67540b25becf7d2c50249dffaad5e203efd83e470b9c577a953fde3f1a4ad529. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USA560458727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc150f93586258ec3d675f650c6580badd8c1927e074227205166b61e1a6d37c. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/FR3EC0700020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f67951c2eb2bdd4d2f101cc1b30603e64d85cd24e71803cbcaac3717413621f. 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/TCAEO1911514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced30a6a96f580f4d92ece5f23da3a4def030132b82cefc3259185c7f20c95b5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR9W12114300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c646ceade7f98d6bcf4c2b8e9585ed925ea18671e0bdb8c524d226ab0662521. 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/DER411800188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebe94c7b33d4f85740f2c460d2816a5bfc6be0a13c8bf00fcf5c8fff27c48b4. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/DER411800189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b58c495b1a614d5f9fadc2dabfaa84d1a9470d63b72d5e25e466310c3e0b8a. 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/DER411800191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336aa900131b86d8f02e444a4842b3058579fe7fd1ebc97cfa88d33cf216c3d5. 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/DER411800194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7146206845dd8c507811481731a48ee3edb6078b3218bb1944fd50a85c37f187. 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/USJAV2110001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0a87bb0e6fb01bbf0c139d1a76c361e6a35f2a7e753503f52501169e75e64c. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USA560537157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77671e3b792ddf5b9a093ab2595ffe5930818123a8ecd6922d2c6c9cbc03dc8. 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/GRPK11600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d34a959918a53835b86170a43f6f93e4df6e8fba52908bcb04a5ba728bbec27. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GRPK11600004.