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 0x667fe95f663cd951e91163f98c62644fb7a6f0887508b36a70a8893457991c86. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9af38119-103a-4430-895f-0a1420af25f5.json and https://artists.proofprofile.net/proofs/artist/9af38119-103a-4430-895f-0a1420af25f5.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 0x429a7c0f9a9fed9e20585453a9f1d471ec7b59945a8c7c25b8ffca50da34a026. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/NLJ6S1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f08f7092b35773a9f7ec320ac994fdf4c595cdf023ec5c200f86ec71f513dc2. 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/NLJ6S1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b503e07fb9307c54da9ae75fdb6e70a5749d63bd62ad17e92d2c0870b8cd3c. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/NLJ6S1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46067c6e6c29b0d2c0b9dabcc8f68172813214db50f8319fa15825a9ad6e5e9b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLJ6S1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7f376348c5a0715886085175c7674a9bc92ac4c2f88adde4e1f82e7e074056. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/NLJ6S2000001.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04d5bad6bc0b07a5496bf9c6e7866cf60595af3cc9973f45f30a7cdcf07479d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/NLJ6S2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06401d2ad57b62eb15ba506a6f39e3f9ab2a2ca95dc692b99ac2d0ed7df3c673. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/NLJ6S2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b081e204af7f43d2a3df4335f892ed9c0fc48058da671670492212088d4c08. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/NLJ6S2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798679239b44a3024bf7173162472a31c8b70f089fd79479226b24b9c9e3302f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/NLJ6S2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2819b3335d8806538c7c0d8ee03fec32213895fe2865587a1dc76c9b69478043. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/NLJ6S2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9badbb0f0bb1d3d9892d234db573fff3503ad20b4dedac8c7b9b673e7116d093. 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/NLJ6S2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5daf3238484bb864e8a98d7c25ec47764842135213c88ad1b01fdab18b6045ef. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/NLJ6S2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11f8ee0787522826f0d3c4b766b6d8fc353b68f4c8c8aa7058af6536257e52c. 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/NLJ6S2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab907ddc23f8ad0fd0c6b25cd17d447c5d6f49b0ff88da68bd1ae141afb232b8. 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/NLJ6S2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798679239b44a3024bf7173162472a31c8b70f089fd79479226b24b9c9e3302f. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/NLJ6S2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40d030c7ec7cd3c37af1517de475f65847fd400bbd0a2c6bc36d6e890461379. 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/NLJ6S2500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a401415d2940ee3069f16b4acb0e4dcb4a5e84e52012b6977445808a478aac. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/NLJ6S2500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7146a82a9dc8b1091dad6eedc7fd641c566f3cf8f814aba50a975745463e05. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/NLJ6S2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653a078f467aad46f9b93cad0947aaa9ba3dbc0cf99e935bcd6f410d488afb49. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/NLJ6S2500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4793de6c5dda7bef87263aa3420ffbcfce71315227e69ad5d993adde267ff35a. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/NLJ6S2500015.