Circle of Friends may refer to: A social group, also known as a circle of friends Circle of Friends (disabled care), a method in social care Circle of Friends (novel), a 1990 novel by Maeve Binchy
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 0x2e12367db4b23cc5dfb7edc1375eb47e94bd4be9fbdc4b98802dcecd82858eb0. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa781aa7-d524-4f5e-84ba-fd9e6340dc7a.json and https://artists.proofprofile.net/proofs/artist/fa781aa7-d524-4f5e-84ba-fd9e6340dc7a.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 0x954ee763e3bb5f080e13dbf80db6050951dad035dd329f6ce8797bfc4a48f262. 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/TCAIC2428710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa013d9cbb52b63e2de0f54663a3cfedd99c426ca00019254df35d641a7f94dcc. 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/TCAIC2428725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88a1af71993a541ad2b814ef91dfd9f9937f5010b448829b683ac99a26a5a14. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/TCAIC2428765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64d10056e8c40a092fe189edf6491dfd8b93869b30bbcbc72d35c1661be1b065. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAIC2428782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a52113ed0079c566111520584732cfed86b5160508438dd9b233649c37ab4c. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/TCAIC2428841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4929cb6762e24dbaa4c90510b4e96c881b11b5730be91deeed6e6db94c34eed7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCAIC2428876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b661eb148cbb52dd7514275f46ee804103881e7153f44a14b6edc17b31d7bf. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCAIC2428892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37690b9975396fdf652b2387606e39712fb83e3b93a89b7e56d3560cdc314265. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCAIC2428913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008f6ee1eb80f5707687fb80b8397e69fbafe46bf4ce2dcdf622857456ace356. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAIC2428940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d922dd53864b63e93799787b79a1abf346d26d6251cd24c95ff36a0f0f5fc34. 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/TCAIC2428956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff369e159548b83b921a3c98158f8f85d9568c9c27fe1c6d0f4ba84f7e79ca2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCAIC2428973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb562a153663e01e155a10d680b041b00c03988649f0c072b95401cadd8b4289. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAIC2429123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e5580a15707bf06038355eb3a0ffd179a0c9b9a77ea52775000c20e8c13078. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/TCAGD2295401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x500a2ee25053d6b2803c2d2d4e44915c22e49466a6ffbe397df6bdde72fdb3e2. 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/TCAGD2295406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9b4b057f9f7fbdc357c1b4eecfded4728c45c30a4b129f4bb13f27aac9c46d. 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/TCAGD2295415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0879c3b74c96379d6455cbbd6312e3f295941bb8869bcc27753ecbb24c5232e9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCAGD2295422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d88820e0c132433cc31ed9e5cced468ece4249df6f2fbf6087a60ada6663bf. 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/TCAGD2296452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d606dc3522891da552684e44df95d22476fe2e1b4738bf7796b474a432a7028. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAGD2296458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2b93d24b818c43ad74aae2f27037aa274b5efbc4b251ddb36ad8c7312cff9c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAGD2296462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d0dfa924cd224a68728290f7467a034d5879f3d9b6debb0f6f33c03318ea84. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAGD2296478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c04d3c895b029041b44b21a9bbe7efdd46bd33c51650e85b72b69519ce2831. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAGD2296487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef94cee8461f1c3accd6d525378c2f64d95a67c9b201f812c73e8ab1d923ad7f. 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/TCAGD2296490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807ef73300db64e8bfd3a4add82a08b619be3ce42c38db3a77106d03901bac1d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAGD2296492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f30ae38bc9a5be186e9d2e0cf8400d6ad8a67f3f499d24410033ec0c81de08. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TCAGD2296496.