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 0x3a6baea14e7317a41af4e9ab5641359a141422b1c1e8437267fc036e073843d9. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1c32c97-5163-48f2-aaa6-dc6b3b2c443e.json and https://artists.proofprofile.net/proofs/artist/c1c32c97-5163-48f2-aaa6-dc6b3b2c443e.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 0x4678ae437473fba790c8e1266625e6f7fdce2336a5fc3b209c62054ce05acd79. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/TWHM72210001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c9dc0a2fc6708bc96b9be72e6beda0afe8e42f4496c09956c15fce8441ab90. 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/TWHM72210002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d36a786628222c8ef8383c3cd53ac2d133c0e6508ce18a51d5380d20b651cd. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TWHM72210003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17baaf6812749456afa7da7e3c6f65738fb8c94ab8890b8e531b9528c3c1e939. 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/TWHM72210004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e3a455c8f4b4bcb9bac92cdb8c265b7c507e6a0617c591f9b341c3d9bc53b5. 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/TWHM72210005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a162cc12759a7e3446aed09c07bff403b3dd7c4192203d6c4cdc4e106f557b. 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/TWHM72210006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bacb2ba890f282b1cb9364a7fd4a555734f46b0daa59b1bd75cf0d0ae3c4e0e. 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/TWHM72210007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a33b6c7694652250916b2eb19f592143efc873d267d9f6984d35738b719da49. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/TWHM72210008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a98b9d1c967f85aa8a5e48a52f0e2d8b8152a725d46eea72e5a0ab09e13bb0c. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/TWHM72210009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443fafe30147378d07b5642d52eb40f5fdb0fbb5612ec220a562a593c47ef1d4. 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/TWHM72210010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45215304c81fe956202b300cede06bd1da864ecc7817f3c7e58713bd3e9d2f85. 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/TWAE32400354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456e9d6dc7119791162988fa9259a82aac88096118774765b6a59c4a5e7819b3. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TWHM72410001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d74da097c0329b68c2a2e67c3dfada6667cecbf8d910bddd600e42f45ce83b. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/TWHM72410002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b0edb923ea2344e3407af8cfc0a923493d2945c8824fe01dda7f2d10829026. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TWHM72410003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427750326d33a7a2c908b859de04204cdfab995e4e748cecf794155f544b6cba. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/TWHM72410004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f73852c57c6ffe9b979d637cf94ef5d15d498df29d73142f4ba7ee01e48f48f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TWHM72410005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef58bf9a32775475fbeabd3016892fc3a03920f03b4b3233697e309d1a93b09. 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/TWHM72410006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92a67b10e0dd81abab0a59919b4b5b30280e14e2e2720f1527c47cbfead0be3. 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/TWHM72410007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c2b3e06cd570eb381eea02ea6115d624d8a520ba5c883e441082bc9bb7fe17. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/TWW532011001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8584190fbb7f7b2721f9fce5e804a87a65e96ab5d9ed9f9d33b683b79ea434de. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/TWW532310001.