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 0x3805eca519fab365e5a246b591ce2f4bdc0542c8d2910746a9f65b1d3dd1f3af. 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/2f9f6a18-cd0a-4af1-ac80-1653df4539f9.json and https://artists.proofprofile.net/proofs/artist/2f9f6a18-cd0a-4af1-ac80-1653df4539f9.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 0x96e5b60e93286c20a8fd7a6be6ee80013006d0bb8da952256ffee5ddc902fdea. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/AUXN21510669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb97d9bca17119ec17cabf24e0bcf28fd5f3662887762e5faf836a18138675f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/AUXN21605517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ac0c4305b9298272c0b6b63e9d0bceccd63e4014f83f60ed65a3efaa27d25e. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/AUXN21605518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0b0de3347fac6989a58bd7e3aca77e10b182d02e9dc397449d8290d74af8b4. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/AUXN21801951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020c026902bbb7b227da7087f2c6fb6e3e14034481f8efec380a550fe5c31e3e. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/AUXN21809175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce43e2cf0928531d65883a15d0757793be8070fa1410a8544f7dc6bcd6c81d28. 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/AUXN21809176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362d7f22c859737f5fdc1336af54db663cffad29257d58ebe3ffd409bda7307d. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/AUUM72000920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01adaae8781316b9c175c26e01bc04934f5c25f6c85418346372b84e51f14b94. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/AUUM72000955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6783c9b4f48f342dc7b28a7f53037dc9fd0192eec5eab8d95be0688853b8a36. 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/AUUM72000956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a1a38711c15bb71675d33d30e0a43d385f00f9a6035e12a02d2878d38f0b61. 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/USP6L2201019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6621b7d63dad3f4cab28dec914c0083a43bd9c28c8a75aa8aa803e929be9421d. 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/USP6L2301684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3610d50d006ebdc3a5e9c5d4efebbd0e6fee9b3a9faad23eae2686ede01e2fd3. 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/USP6L2201165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24b5413583f4b4830de466535c0a7adb29d2f00be4dd8fd0802bb35c8a40cf6. 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/USP6L2503368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff89bffc7261252ddd95fcbe1152f25e595c4c10ee03fc78a12276f5bc92bb2. 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/TCAHY2452109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650677c358a2679f77b1c91f9cfdafcabfcd7324c68de62d3782b69fe2cac936. 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/USP6L2201164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3610d50d006ebdc3a5e9c5d4efebbd0e6fee9b3a9faad23eae2686ede01e2fd3. 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/USP6L2201165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a1a38711c15bb71675d33d30e0a43d385f00f9a6035e12a02d2878d38f0b61. 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/USP6L2201019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf7e3a950dc3b05e276ff2f041687d4c20f9f74b6cee2215d97debaba4a9a71. 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/USP6L2201167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d30b808f355200b6ae3ee056709219aff8c7fb565f5c2c334fac13eafb4ec5f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USP6L2201168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a5a7f27ad4a05a66be5cca028c3c17815543bff3f61f1e6786495d1b543393. 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/USP6L2201169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22548e8c6e41afd02f57effd7348d6e148490a763d4fb7ea04e8252e6ef672f5. 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/USP6L2201170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3175ef4a2cfd781b792620d9ae42244825ec03d281ddd77fbc16d8daf315d33. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GXBAV2391775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff89bffc7261252ddd95fcbe1152f25e595c4c10ee03fc78a12276f5bc92bb2. 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/TCAHY2452109.