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 0x32b08d0bb153e4c12585be533f21bda4164364b085599be6b9370523a74bcf9a. 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/c9e708ee-55f5-4cc7-8499-7461c837ccb5.json and https://artists.proofprofile.net/proofs/artist/c9e708ee-55f5-4cc7-8499-7461c837ccb5.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 0x23515c5dd118e01b2a19273bd3456862944ad746fb8f2624debd00f436300a1d. 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/SKB991301401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d6a4295e06a8447d4cbc039c0a6df3d84a8694a7cf9a51b4c927e2a704d2e6. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/SKB991301402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd5fa2becdceb8f6e1c989e2c71d1475ec5995dbe7eaa66028f20dd13af7f3b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/SKB991301403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea950d8166e53b96e52e6ed85297b46341279c25b2fe5f77e0319b775a326d4. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/SKB991301409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97295050047e310b892c258ae01a83002b10b9b2ac08c6b89d08c713d583df95. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/SKB991301114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70852b05498490da7db1b114a37b64f4f70660281758009b22af99e64a748ea4. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SKB991101108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d70871f7856337f17bff96a32170a920aef7b0bb580cdbbbab13fbf19f708fc. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/SKB991101109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6241c421f40a40ce4e3773e85d6a536296efd325fb0b78fe3ea7078a75eb05. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/SKB991101110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e986d05f395d3c0299c4fb767760d05f0a12506fbf14c4a2628e688d0ec2f9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/SKB991101111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407294b51fa2b0798560f381e5703906a2a7bee92a78acfbc849716066b0e99c. 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/SKB991101112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1486fbaeb12a758f302aff8fa7fccb2b464001e835d8ff5fafc27e1ac97e614e. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/SKB991101113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35356b6a6d6a2ee4d2937ff6381b9a0b345f04858e6bbcd67ff231508400e1d. 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/SKB991701701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f1c9f125f2a561302dc3127178abbeb29db7901a79e1b427778ac55164e71e. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/SKB991701702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1acc762cfde1ffa192546aea0220021dfb68135c1d43ba8eda0981f8d06c5ab. 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/SKB991701708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef07db1456e705078a5b3625ebcb2b2da6ce8d95e6315e72474eac7c1f07814. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/SKB991701710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5769e1ec7220269a7b76f39213fd2afdaa21be5e647555afd9b57c9a91bf39d. 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/SKB991701711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1ce2562d649034b7ff7bc7b1895f9be50d3f41a2b6d8b0aec908cc359409d3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SKB991701712.