C2C may stand for: Transport c2c, an English train operating company c2c (1996–2025), a former English train operating company Sea to Sea Cycle Route, a bicycle route in England Coast-to-Coast
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 0x22eb8f6cb4aeac767bb5f0e8dddedee9bee97f4731aea483157b083d326188c2. 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/5e3104d4-67c1-427c-9d17-aa7620a1864d.json and https://artists.proofprofile.net/proofs/artist/5e3104d4-67c1-427c-9d17-aa7620a1864d.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 0x392bff4062d8359b4dae3ede8d63c3387396ddf9011b1ebdee522e56d202a660. 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/FR9T31200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf180b63d823317523b5267229ca45559f2ff713ff6816bc3c08f9dce12b31be4. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR9T31200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee327ebc22c6f6b00aa8ef332468f09e0667b812f17fd81bade1bf9c7817e4c. 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/FR9T31200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5bbf154dabc44c942d158ebe0010d856debcc42590f50ae1155448e186c20cf. 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/FR9T31200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496a9a26df298a9c5e787c448aab1c71604e8b763bbc4ae2763262cfb7c59a7e. 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/FR9T31200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa643dd2f67961b06cbd602c45ba052d22f4f7250381dbb478afd5085ba9e340c. 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/FR9T31200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4e33e3cf8b4eb701eac520943dc860101d004be42d61b84bc87188b350c2b1. 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/FR9T31200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3285b8c108ccc4c8b92188cf4ee5355b6a1c511c14d8da29b81716e1a8dfe701. 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/FR9T31200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689ab4e5af2069460f513ae3e50112e2b0a3976380e9abb189172ec4a2e34f38. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/FR9T31200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75076fb73d450cba5901b6d94289dde3372d78ccff2a0ae3750f419f75073403. 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/FR9T31200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef36bacbc6f3c8d26b6b80cbed6f61b278c0129f0b507375f63c60f85141b79. 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/FR9T31200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c972e5e1439a6ea8f444df9b861582ddb1739f1f3f5c2c749dadcf130b20c14. 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/FR9T31200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b6838f21ee1e2ac2a46ed33403a9dd77d717232229b12d165155c6de0373a1. 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/FR9T31100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54184e826f198385b4a205b45f18675f7e0c5a0855f2d66e4b3e05fdcefd8eaf. 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/FR9T31200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccfafbd34150a723230d8fb5740db73568bdd80b230a57a71b4a55d788ce93e2. 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/USUM71307280.