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 0xacaf02847c0f9ecfcb8c88d534611acddc018143600899355b45de9136b9292a. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a678a263-271d-4be4-a7dd-4580d90f7cb8.json and https://artists.proofprofile.net/proofs/artist/a678a263-271d-4be4-a7dd-4580d90f7cb8.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 0x2e67b27a54365d60670f5006a93c1399988dcc325f48e51f80d27df3127ac6ec. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/PTRO12000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda084eb6304e5d8be4f2f768b7d841ed5b581546c4472ddb8896ad9a81f158b. 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/PTRO12000003.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943ac824bec6e76df2936b3d826112c0b25911d460aa628adf8be37a0e3845f5. 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/PTRO12000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f212ddb33b0b109a58c55e61f0534f4e841e7e3dc540718cce28d1909cadea2. 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/PTRO12000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b4677456bfdde41bc616570f539d1426b82c39cd42a8cd77455507c1462162. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/PTRO12000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6d5823ce71264903ff30c0ca86d1165637c3ba03502a7b742921ebc8e86df1. 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/PTRO12000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d801b511a8007414956b03627a068d7457f96f603dcd2035851278c28957c61. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/PTRO12300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbfad2f708193c9358e1e22d7fc6cdbc717b30d694e5eccbce752307632b65e9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PT0HV2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae2d4a4d634ef7ada4b326b0372fbb8463182ff22c17d95db42f3d73d119a04. 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/PT0HV2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3338a313454c6a1248897277f5cc72dba697bb7e11df96c3aaf25d199338a2b. 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/PTR012400085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63598a2b843d51fae3929517758eabd10e647e0d9d729249027d8cd571d0a854. 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/PT0HV2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e0548eb90b773d24fb43a1c3007cfda632df441defcfd55f77b7372d03e7dce. 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/PT0HV2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebabcd59a6a206c58c1f2a65fc3b9bbf13c261c8c75d8407fe4bcdd2a473a9c. 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/PT0HV2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c06c4e4cc750d32f2bcf84a040263ed94450e98a2b38db22ae6f8946cf65fea. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/PTR012300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0547aec09696dccfc18b09a885eae79d6e88f59f7442b9cb1ead283d70da97. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/PT0HV2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbfad2f708193c9358e1e22d7fc6cdbc717b30d694e5eccbce752307632b65e9. 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/PT0HV2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc059628c30e8051ab97f2a6947c37727db0460c7a1fbd2f80b7e50814a66df9d. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/PT0HV2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb0fe439e21e05219c86ed03f2ec0d600ff3eafcb32a6bde4a9becee7d1fcfd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PT0HV2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd3e0c45ddec2589a94edb52afdbff3e950bacc143160fb6d484598e6c80dd0. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/PT0HV2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9c62f63cd805e875098d33397a184b9e0445c71a85a9d22531bcbb2c5497f9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PT0HV2400010.