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 0x9b57851a06bbb9b482edf7550fc16c3dc443c9804c1951a4bbaa5b68e1cae30c. Chain 2 (Bitcoin): anchored in block 953736 (2026-06-15T03:21:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9803a2cc-55b6-4328-bfaa-c2b7491a0df0.json and https://artists.proofprofile.net/proofs/artist/9803a2cc-55b6-4328-bfaa-c2b7491a0df0.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 0x9bb78ce1e8d6110f77181164c3cdfd0005e0b69ebb6ad7e541a64b464cdb35ef. 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/GBAFQ0700088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783845da5911401b697dfdefc40c16067403feb46a796098b3e0f64f2eb7cf9b. 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/GBAFQ0700089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119674cedd70cc74f924030b16b788e27224cb3aace2256f169f4390ad333929. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/GBAFQ0700090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc4ddb1a077ffb7b20de55f70d9582d68f99b60418e82d1538d9a04dca15192. 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/GBAFQ0700091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef962341dcf3b335355a7c50e857c3510a3824facc259b305867ba47fc9fe8f4. 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/GBAFQ0700092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69315922c7b1ee7d2593652777a0c7034395b3c69defbf3e17de7744162735ee. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GBAFQ0700094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bec63481ffd694ca5488a8326b1992fe921c1d69330816ec71c72697eef5748. 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/GBAFQ0700095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d42366d14a94a96e6912b11e7fbc22f082545d0a4956e741019cca3c91c5755. 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/GBAFQ0700096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ec6fd50d5a8b3adb31c8b19f587904b7c3dad26e6b33995376e05ebcef24e0. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBAFQ0700098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96be7590a73512f28a1ed58d1d4b2d778acb607bd505a4312c684a3735dfb4ab. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBAFQ0700099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44befb319a32fa9017475e1165f009c276b293e81e34e81afcf1e45dfefa413f. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/GBAFQ0700100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b1a3feff294e4a469d98de2c5d286cab2349a92233abeac41296de761ca98f. 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/GBAFQ0700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056e3dcf211b3d9dbe3e26c6beb02ce9471e2d8d0d8a211043b14cd4da2c1fbb. 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/GBAFQ0700102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4be1a3e393537edb9619a0597546f38561c43a6df35329cf664cbb4b547afd7. 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/GBAFQ0700103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2b6193e8cff9470f10d26f49287d9f39778d121b1d9720a9b4f7b6a8206389. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/GBAFQ0700104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb52db8875c54975b1488ed110aa54e453f71bbf5cf3b5e0ac90cf7baff83da8. 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/GBAFQ0700071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa987d1f947b680c277af607dafa8195f5b9964ec564ae94d38552cb71f427dba. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBAFQ0700072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfeee0cb90933d54f302e41e1733f9a54c4c771b7f163020e636836d4501a218. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBAFQ0700073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77316e5639a657dabcc5917d6a20025a3342a3d10df258e7d7a5d43975944d39. 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/GBAFQ0700074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70116283424400313d64245ca1f3f06825f25c71ad8a0bca6e02a01f74fb8101. 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/GBAFQ0700075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52e3381a836a47c41ec1d9694a3c5580660e66b0c64c4c2a8d2f83bf847a80e. 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/GBAFQ0700076.
Medley: (a) September Song/ (b) It Had to be You
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdeb1ea97f3af7f132016b0e345a4c79eb8c2cd3f8ba387b8a7e94ac9e41497. 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/GBAFQ0700077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87785f99b4aab2ff287aa659b8378a856ef12972e70b6aa9312db4947ea3c55f. 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/GBAFQ0700078.
Medley: (a) Mountain Greenery/ (b) Day In Day Out
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7451d6ab00a7520d76f0a23b7d353e8948e47cfa707620bc7226a3492c5d73e3. 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/GBAFQ0700079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4052c27161c46a0f4a04afc163f762aa25c4ae3707a3600d7e3dddd7d2de1f5d. 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/GBAFQ0700080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d07279ad2f2989093bc0c802134593c933a471871776a412d1f6c0c854c6d54. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GBAFQ0700081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648283c8006197186a510868c15e26b477e18dcf07763b2514cb793f7d987fbb. 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/GBAFQ0700082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1346ad64d42e543a2df435bd97c75b8e35bb897b3c2311e85ce4199c36d49176. 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/GBAFQ0700083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbeedf17835f33cc5726068abf9745ca2097890122b323280209c4cf375f860c. 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/GBAFQ0700084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c1e4c0ce005cf0afcbbfb369c356576de5b707ab449889ba7f48a430342434. 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/GBAFQ0700085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36af715fa52d44cc90603d4cdb65ae5155b4b7c6989e1815442b6b92ce378330. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBAFQ0700086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8157e32dfcdd3a72ea56652af543ed9580926fa138566247c8baabe289c55b50. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBAFQ0700087.