XIII may refer to: 13 (number) or XIII in Roman numerals 13th century in Roman numerals XIII (comics), a Belgian comic book series by Jean Van Hamme and William Vance XIII (2003 video game), a 200
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 0xebe6c00304f546bc41f9fc664cfa6d1a5832b19ab3fe28da52a2cb2cbb56555c. 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/5e8809d8-efcb-4697-b0f7-a1ec1f30dff1.json and https://artists.proofprofile.net/proofs/artist/5e8809d8-efcb-4697-b0f7-a1ec1f30dff1.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 0x88e02969c1a558bdf77bcda3a63635b3438fe7c24921aeba37fbf3ad4b48808e. 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/FR2X41976534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2f00dae6f148c3577705470ecc155af50f5fb127e27773f4825f69b59eabea. 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/FR2X41976535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd535c13a3eef5985d88349f68c5fa9e3dcdb7b7c59862bbdab5bbb5b1e2661bf. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FR2X41976537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3291e2f9befe729a99d596faad197ff13776184068e294d58e824b838639706c. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/FR2X41976538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4823b3657cab1863934c08f20f587a3d3def4754bc2976f51474d958abe2595. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/FR2X41976542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80f47924199d624883de03ef525253282810cb36f66f067799635ea3f914a7e. 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/QM4TX2129314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d7d9a17e3f0a89599143ad06ccf20127a15bb16df965998e8b50b7b0134735. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QM4TX2129426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90988c1f9df49794f60e78e3e72642ce6b4aa92c75f8fafd55b11c9b1c78596. 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/QM4TX2129321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0eaea52a0a9cd02c4f42a70ff2d2caabc304d90ea4d0b4530e116f376f060b9. 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/QM4TW2099821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8919e44866795de936668d337ad92df41ac7c3d919082780d379252cdf4def. 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/QMFMF2124302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6189856b1e8e9a976667aac93b170009b3c3e3367e24e0e4b21ad4f5ae84c293. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/RUB422201427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x513d38c41d08a9f43ccfacc95a5c7c2b3669298a982350121a8aea76275cadb6. 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/RUB422202659.