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 0x4effb243191d0cb2e22b9b8b752138bfec01bfffab441a806fa6d5fe20f105ca. 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/d92cee86-a720-40e1-90d5-59e78cca23fc.json and https://artists.proofprofile.net/proofs/artist/d92cee86-a720-40e1-90d5-59e78cca23fc.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 0x39c16e2e0ddf03fa9f5b102b41afb1ea6d66350fc117233db38b6f5e2d9c866a. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZWFR2408542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d59d128660803d734977c873b369c6f02dd0a36bfd12ef6f71ee79fb9ef8b3b. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QZWFR2408545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157b1160224bff91105d228f1a8013383659ce8d5e75720cb6b20e7caef7a704. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZWFR2408547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53058d42d3474c9ea4ee99fe7c0ff0638ea9fae886b9a505f94b81a21564555a. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZWFR2408548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf801054dbbcee5c37d2c90cee91ef5078f71ee9ba703c3d53e6ad7667750b21d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWFR2408550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711954f5afefb44ffb6906df0baa1956ed0be6f56b543dd3ac26893ff6964449. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFR2443847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe340d5cc4b1c78f22c8f3f01387d55f5e1b914d021185b9840a58e861618ad25. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFR2443848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1847e184d83cf338e566484cbd4968e70d233015b255b942d3c4b429acc4f511. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZWFR2443849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e4f9da065d13dee655c7a7fcfebcd9c2b3002d2cf3fe7f340bc51e2ba890b3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZWFR2443850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f8b847632555679fc31600c7e98a13c743c667d93f4b28aad262d59d257e22. 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/QZWFR2443856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fabedb671787d5445eae2c96abd94e3fdae57f0b1fba557d14d26e55847798. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZWFT2471818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857c94a5c0daf5bb2bc71ae75c40cb76461745d8491133e9d48ff2f418e8eeed. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFT2471822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2c63e925f5e1c10c8114cea957ea4d01b3cee2ce513efee7ba117f02f0c93c. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZDA42537262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb403281d7f4b0a353e4c01d8e47ac11c8c14ad88c6680ef4518cd88730b5e3d. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZDA42537266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61bcc1a84a9958c594448dc4224921af9e8784ba521aace81a07adfc5bbabf36. 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/QZDA42537267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f9f07519b3fe9df52268d59e15d52cbf4aa988dd876987e3da475fe86c1bf6. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZDA42537270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92081c5db59e961835849bb34cccaa42e7772d76555dca06ae147f0319c2432b. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZDA42537272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d49d844c78d4e6dfddafe6f4487eab20b8e5d313963ae7e0c69237c5c91df01. 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/QZHN72533509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5985c61e50f0dac255f9368f15d96e60ef5d337b2d96692b3af6c45075a5b008. 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/QZHN72533511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9001fa45b465929170e6b60ddac6907b3cd95dbfc4ec58bd49fe19b0be836ff2. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/QZRP52533798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea71c89328f0de7c35c44e27c4a3719903d562183366cd2735bcc2dedaaeef52. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZRP52533800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4853785f7336e8552977099423ef42c28ad17820d5b174259c549c37014b5dd6. 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/QZRP52533801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd374dd68816339978ed444fb47ca36463a65d71c22a6ab452a06ebd8153c3dd. 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/QZRP52533802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12da6e8fcd1535bf6952b8389dd578b3415d58ecc0447a84c25b41bd5c0285f5. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZRP52533803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb03a513f9dab8777d2340ba7354ae1a3440d590b15d698f1d5f1837eb387c0. 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/QZRP52533804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe784e1a49c2ccaac22ab36d61db37d32479d8ad6e0b74c216831446afd61660d. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZRP52533805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf090b5f938be75c993f3c3ce2447523e74a29d858bc373b18fbc3c20e0103c7e. 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/QZRP52533807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3bc09a9f8e3bb5cc85b43b2e112d15131019292b7ca08b33b38f65bf3fe11d. 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/QZZ7N2528493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95fd73c00472550c5139d5db151c5e9db48f492d3774b1b0c8c9933a9afbe75f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZZ7N2528504.