Subspace may refer to: Mathematics Subspace (mathematics), a particular subset of a parent space A subset of a topological space endowed with the subspace topology Linear subspace, in linear algeb
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 0xe455d54c394803caddbd52c45990e1d65ee0fa04def10507f72d3418fe393572. 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/42891f65-5562-48b0-b215-19d73a5bc39d.json and https://artists.proofprofile.net/proofs/artist/42891f65-5562-48b0-b215-19d73a5bc39d.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 0x5e465e575dea47cb01dc78a83b353682f613a2e1dcd44d61184771608e2b9560. 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/SE6I32121804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b4078c4bd7aabceac9ecacc6784971e6783195f17745bd9534d86f26b2c7d4. 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/SE6HN2233347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9324b551f7a12063a2f15098b8b27884fe1a398e7320db491d755cba40a7c72b. 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/SE6I32183931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1f0796fb63dd8b1398dd4fcb61b0ce6e7302a3a92a9abde75b98544dc36f86. 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/QM7282465279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319e1c2d6a675a7f253bf26fb8373dc60b896a5f6c97e1209f3f436c7937efe2. 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/QM6MZ2473037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a362f55a7665fd1dbc16c1d87d5dc182dab900043074c2c28d268b93d5ce955. 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/QM4TX2436099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ecd57fd5d2ba1051c28d380f9e8d6afbcf20086d5ae8d6c9d2e0e13f4edeca. 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/QM4TW2387424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9489b8cec60818db81ff36ff71229171320f8718533ea66fb2e6099d2ec557. 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/QM4TW2322094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c641f6e96f815dfbc0e92e5e172a695cada1c3051e2418ca73abd62cc01c5e. 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/QMDA72226545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8edf9f056f9cd84692bed6a69fdf721bc681d44d434bfac09333b2bd35190b. 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/QMBZ92290968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b75aa98b0f4b0bf95d08a044827076962f2ac5c27073f371e8a4f82035140a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM6P42208960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ede43fdc08a6bc6f2991e59d249d403721e8a8c7fa123dc4e1a00a18d5e48bf. 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/INUM72200142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d282ec91a5deb4903f11688743e01a9905507a1de483e4c14e3c9f28112166b. 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/TCAGC2295083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31983f35713fbc6f04f7c97f3b5f91a66c36e68341a23beea54ef0398e53b09. 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/QZFZ62267488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62d0357040f00d89f2f24da2c19a9f7dea50f2eae2e929c7d68bffbd17a110f. 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/QZNWZ2152697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3e360d45ec41cba702f9908bc4cb8df886fde7ba3c1da653fe7eab86a15b6f. 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/TCAFT2137086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651373f964fc50d904940b9289f55a02a1a737d41525cf9d5c1d790add55a06d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6P2120360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5bbdf961bbcbdb8590366679903e21fa0ab122c40f56e975fbaf721b2fecf6. 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/QM42K2029571.