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 0x366584a36e66cf065260b623cf6e96d1d522c43083e141aa874c3b95416b7b8b. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aaf55731-93c1-49ba-b636-efb9de47fe47.json and https://artists.proofprofile.net/proofs/artist/aaf55731-93c1-49ba-b636-efb9de47fe47.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 0x57b8de48e518faebc5ba983909a84c1f29bd30fa9abec855317af30c78de1bfa. 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/QZTBE2417549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4ecbc46de2a4035c75ec9b40149ed8a8f2c965d58768ea51275581b2d34702. 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/QZNWV2388771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90555a2db47eb5348c36073bcce014dee125b69601ef43c07f1415c7a52b6db8. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZHN92315859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a49b1b65f401b8e3de5dccee057b2ec00a00944eaf72a1d7ed6a1868844bf8. 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/QZTB82202068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0967b11df28f85d22ae82775decff89d7c7ac0725bcbc94fb622be0cb4130360. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZK6P2217701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f28de057b7b6058cbc20310997a97e59a80a45b6cbdf23be75817e627b72d8. 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/QZK6P2217698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x771f89f61b04b0dd95725d6baf6a1dfb536b8d15b7c915e0da9bf87d77336d8a. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZK6P2217704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110e7cd4863cc0c300eb6986c2654427416314bb8d693d570aa74176f2cfd619. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/QZK6P2217703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0efea23e624e7e4f5fac43fd0890060ed7572ab309c03b05449f63ffc08bb97. 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/GBKQU2092031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc091a1a0d2df02713df69e83ad531c522b12ee31516f6a47bb1229c49c681959. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBKQU2092032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff6972a25c44c551d181f05de480ae9e8011c32454370e2845a46a7ce48e7b7. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBKQU2092033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa858a9f01f1dfca89060295b6a0d6554cd39fed9f8bca11c2bd47101cc461b0. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/GBKQU1949078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44517fd0430d7ce766e53f8f21eda052ad746ed405d20e5264c4d412f4dfc2e5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBKQU1949077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933907a3204c735f525acdf58343a22125f1d98fa67eb79e7577a0a0f890ee95. 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/DEH742403623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40403faf334e323bf79952cecfdde0c7c20c44431b04178fed2e4944b4c19e62. 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/DEH742403624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976edf0641eaf317dcda4c7b2924bf9910be42055bb255f51cf39a8531d1934b. 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/DEH742403625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d63afc32e7062f3d1622fee961f60c7f67968963022e0713d3e51679b61c90d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEH742403626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ef859cd9fc469ceb77148a0946f23caae728b807f1520bea109598a4bd8980. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZMHM2062654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415a0702b275217d634ef50c9aecb43f062e7829234523f339881f1657e2951b. 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/QZMHN2030979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2b1edb53fb4e892819ceeaaa31c2fb38b99a1b2bf8f046e3b57dfa13f08662. 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/QZMHL2355465.