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 0x4300e43bb51fd6d9e89e7515f2cb1568293e0174256a9e8af0c357a606e25bc4. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6bda6617-1b99-4c38-b0a5-4eacf567ddb2.json and https://artists.proofprofile.net/proofs/artist/6bda6617-1b99-4c38-b0a5-4eacf567ddb2.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 0x39170f0350c14371965e277c6b4640d7a122b7a18568ab3bc41e952ff3b65f84. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZMZ92245815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1543ea96adaf740a74694ed854eff3926c2648c5ba5e824cb3103c0b0bbcd7e2. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZMZ92245816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1fd7432823a38e64d5cb97fe65b088d497ed990a086cc4583bf63835345b11. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZMZ92245817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe787d9f43d12f28704d9329c8534abddf3d538b9d0ab4bdcdc867927c593b401. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZMZ92245818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8d9d1c91a3280511df6781aa3218e381d29ac02c26f956a62521381ede30ec. 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/QZMZ92245819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58404b3191401a978634dde6dad3c04237d96a663dd41ca794d711da32235d7. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZMZ92245823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0c469bcbded72d3bf24f5e37be11d5de4bef9440cf400574430bc0406ec96a. 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/QZMZ92236036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3895ea1a752ee6e71a69a2a9179e6de5386b36084bd10ee3455e98f599fcef10. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZMZ92236037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915d288bf4617bfe63bce24a6fdcd52579e7a6599a4a93d8a3295e0ee1b0d043. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZMZ92236038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7a8035023959501d2e31d5182b662358a6cca2695df1c8244006286534c5bb. 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/QZMZ92236039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d056200b34847241e9b310c289f11f69042f1ae1e67e84f702b86f4eea1fd59. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZMZ92236040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0409c9031d23198d52e334e9004618b2dcc13eee2e417c5ad5f99326511ab2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZMZ92236041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993a36330e25ccf732d9c3ce20a117c46c9ce1f02f6731d385acdb72cc377f04. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZMZ92236042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0fa70124dcb82225af37e2331c38aa1024c6af33f950e32e49d07c3f59edee. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZMZ92236043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a60f6f83420a9f29c07dd38f5213abc2000b035acd56482e3700eecd527c82. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QZMZ92236044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5862840f5265a94d2bd56993490caf3f967911c3e9386360a435c5226f571d. 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/QZMZ92236045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece306ec5755316d1ae26b21c9439ccb15d2581e1b8b2cc9d2f616a846ae6442. 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/QZMZ92236046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75028ebc624a6248b24f6fd71abce4ab500c8f13bcd40a8f088819ee8e1d19d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZMZ92236047.