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 0x76bd631af3277bb0a09cb3e5b0a5370f4e7bb8a6b759e4a69272bcad7398f976. 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/8d743636-b7bd-4cb6-a615-207b82c82fbd.json and https://artists.proofprofile.net/proofs/artist/8d743636-b7bd-4cb6-a615-207b82c82fbd.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 0xf625eb297e5f02ec365ed94377d3f1c1210ead53d3cb8b4fd8e42e827c307c17. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USCGJ0725237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af4a11583ee18d4ba1f2926cbb7dd8d5d50a8ed644c81fafd0cc51070aa8434. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/USCGJ0725240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f14964f3b04738fb1a2d9ad55e1e53686c484002080e80126ad5b1514a8e9f. 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/USCGJ0725242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858230dbd0b8b7b223306286726d4bfa340c941479eafffe45a5f9c64946a8e7. 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/USCGJ0725243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35106100d23f4ba70c61ad6705bd2c19b9403ece16982467a09677d05e9077ab. 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/USCGJ0725244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac001c69bca991c056b22d5c1deb460c895519b5cd28d8447b8aed2197c530ff. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/USCGJ0725247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265c4340819f323f43de3457828a41a3ed634d83e4994d7a3f804b36508cf160. 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/CAI370911072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c29acfe80b688d3811f55dc4d82ad8ee0a63959b20ee547b73f3f615df86e2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CAI371110257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d31da36c80e4c6bafb90b102b7dc5086146eccec5667981b8fa101c6e95fedd. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/CAI371110262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fb880fc3f0312712ceaee7fcaae9517b0f088c396014838a4265b15def809e. 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/CAI371110263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba768f6adab3c348c4aa0c8b15376e9b434393edd48357c010587cb09d80bdaf. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/CAI371110265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd518a2120f8692ae9d54f9dda0aaf238c8f49ca3b8974032179b582a618e64d. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/TCABW1498432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13abd79a8a88ea4911e256e1f1ae0ccae14b351e27dd4dc391d9155ee991fb94. 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/CAI371714514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265c4340819f323f43de3457828a41a3ed634d83e4994d7a3f804b36508cf160. 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/CAI370911072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610ed154d74d2aeb91201dc990768c5875ed5c0167e324afe339da9e11e97cb8. 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/TCAAX1144948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e941a47ac2b44a08968dc2f2094c5045ec763fcb02a17e2fb9d5d985497e927. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CAI371714519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974b980450461def8de5cee021ff81d5575ff5481d2a54e1465c1e534091709c. 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/TCABU1425300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d50ca9af31273d75455fbecb3baa5684e97f4507f31909ef20b50f97b4862b. 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/TCACN1631231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7277babf3469fc0724fe50d2a4048c3def34f75f7d60abdc4643e15d3bcd7e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CA66U1202191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258e9708b66ecbc583b1752bad61e17b79eba3f72d2e04d421c0aaa18a6cd94f. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CAI372500200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda755a98bbe9bdfac650f49fae29c8daa2e93e9bc3f1812a683af421a7c05803. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CAI372400897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ef6fef9c0a096be09b1aa37bf2c631e7beaf1c98a086f327f633923816fbe0. 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/CAI372301466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c0074fd99e3e004d27524a22a6840fb8b3883b1ffb6540510f093a5c96589c. 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/CAI372500202.
Squash Comp Presents: MTL Underground, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7beaa260cd253023c2f4efa1afb3d2abd14fe0ee5f5273f254aef05913159819. 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/TCACK1569868.