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 0xca84e3c9ec6f510aa90d4f5827073c5f39a67ffaf9d3ccef93cb068a9c6600bc. 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/899d5245-6260-48c2-b6ba-83633fb3ab14.json and https://artists.proofprofile.net/proofs/artist/899d5245-6260-48c2-b6ba-83633fb3ab14.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 0xdc5ae88ca26a46c55f56c5fc4b025e1c29bee4971c6797c90fe92ed1ee0351be. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/MXF601400557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda231b0d7a40ae0d9192f93c52e167168e8f1a590f52b79ce13d0d4ed513b32f. 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/MXF601400544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe6fe0133cc0ba6d0376200ab948019bfbe7bc99a85624680d0c32df40d74f2. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/MXF601400546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eaa6f774c2889b78435cfa4003df8fd0e0a9ec571ff12e4027ddb622d3cbff3. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/MXF601400548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc77bd130665c35b336fa0427aca21b2d94e5e67c914fc06ed50376e1543a581. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/MXF601400554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29fdf5f30ac27549e3386034e7b7e571ebd64e053b730abd1ff82a6a20a1119e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/MXF601400555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d12e0dcff852702afe73b64110c762c7e75655d057b3097e8be05f225c2362f. 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/MXF601400530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9faa4f0f0d280bb3f7ee7afc6c8e579cc307621eb3d73013ade3346132f1b5. 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/MXF601400531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046ce78e36f8d0d0f5c0fc46f3511d6093c66b861bfdb4d6b6124d65edc6ee47. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/MXF601400532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf37cd833163ca33f0d964e05678ee1fba067ba1bd5e43d832a82febee835c3. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/MXF601400535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d7999ac7b24605bbeeb00e96e759398e48bea03698962390d6f789c63eacb4. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/MXF601400540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568a462ced0db670d7b7044c3e0e8625c36af343f573296c38f6382d831f2998. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/MXF601400541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38bf283daadee29775811577671fd4c4d06278922bb17b487af5fdabee8087b. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/MXF601700342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34b45da338744459b3d781aed4c5820ba332a58222efb463b9306a0030b60ca. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/MXF601700344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8ba896e792d9a925cef0621bdb2cfe66f20d11ca42c4fae1d0eb781a5304ab. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/MXF601700346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629cee673d6227b37cd36ef55d83c0e0c928f3d969357ddab699ebd8d7e000f0. 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/MXF601700347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003d76e1dc22626969a6715e4ba32561da3409969d0f73247c8231e38198fb92. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/MXF601700348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec2fa6a483c41030b8bda77e5cf686562c2bcf6711d3a6fc796d4442d8b5aae. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/MXF601700350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefdee12c5b778765281f94d7782bee926a9b0547c3bf2221479e0b2d68744c2c. 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/MXF601700354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5df1cae7701f0e49f61cdf2f9d91c78ea56c54ddb7f93351fa9ece31db014cd. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/MXF602000330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004e43dbb696d07577defc46675de0efc86c79fdbc425d68563d9de86317751e. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/MXF602200255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83855c2c607cfe3d335e925afd14ecc277862649cb95d2ac9b02f6c1d0097f4d. 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/MXF602300414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c559e25ba89c592d03570459a14a4635d5d04577ff961278b586f8d4a5d4af. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QZGLS2087185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29defc58be5063da03a213991fc44e064e9941eef084e45eae429e81b5a9a00. 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/TCACN1667278.