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 0x67061c07dbc3b4153f76ab14de51a27f665fa37cd0f912f54ddd740eb7b83e32. 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/b68cef41-d7e0-464a-8053-14c0200fa006.json and https://artists.proofprofile.net/proofs/artist/b68cef41-d7e0-464a-8053-14c0200fa006.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 0x23ff674f009bb4b3f3d278a9c60adf190b53cad58fefd697e681bf002ddff64e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USASN0903788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5154ac218b0bf5a06eaeefb424b7a67e3e5e0e1121e7a107b0ffa8608d727006. 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/USASN0903790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4bef040d9036f4c73f1ca9789ea89d10dbd6142b578da919e9625a55ec3394. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/USASN0903796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52e7a0e29064c017bc6043b75303e30e3d67df1da026fcae5b9945a20f743c8. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USASN0903806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413f48c6f03ace57a4a27748d671f5b8d49d8e93bc669b14ecc5b740e167d7e4. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USASN0903808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5b39d40fa768c48773716aab557f614631df63e344c2c4892d0a0f33e94a4c. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/USASN0903815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd4960494f643d740bcac8c6c6adf6a742439841073e7b10789cf2c789a0030. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/USASN0903818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1bfcc9bb9c259e423d5077912ff50a4e891414ea3ef023c60bfafc31e46e25. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/USASN1003314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de310ec4244528072ca0acacf4e02f0b8b21f02a66a5d58818e261c53ba6b2c. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USASN1003315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1afef9c72c19942fe4832aa0f7b4e5bf6994985303984d8e9805266d0eef61. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/USASN1003325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e61ec4c9f41b32789155e917d555db06391808794b262cc2880818aa2e341e7. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/USASN1003326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a873a54bd30445004549d78c312a8b21bd3b80af6fa6873bdd706f1813e1864. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM21622250.
18 Years & Counting: A 20 Song Best of Retrospect
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267beebcc42f4721e9da1fd9bb0d57655d16f7e2a85b0c0199e3b92a046639b9. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USHM21891582.