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 0xcc3b0670d5657adbb278742db6c46e1c675730120a6784e4167d31f8eeb6e49f. 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/1f67c666-1275-4189-8fed-a27c0dc9d090.json and https://artists.proofprofile.net/proofs/artist/1f67c666-1275-4189-8fed-a27c0dc9d090.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 0x7120d2001f7582ba2685da11ed3a7f0d847adc9e768aff94aae7ee8ae64be9c4. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/TCAEO1991736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a8e0095c978e56687098ec5cab0818d800dd753d3ea75a81c745468283fee1. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/FR9PA2100203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc654d9cc46bbacdd4b7c3e2b65ec7b4ba48753b0ed3f6be09d4c5856165f4bc6. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/FR9PA2100204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544f291c8f158e5e81fc9d41dcbc82e34db836cdac738054ee3e3dd50422d41a. 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/FR9PA2100190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95897d0e72f9efd4d5e52088bbf9d8473b7f645f00c8a0bf8e4913ad55ba74e. 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/FR9Z12100316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b20e92acfa01a7faad90c86b6b6c6cd8e49d992f83762c0f922c079bc6ab5f. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/FR9Z12200026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa260cc4d5d48584b0808dd3eb9ffb5041f6a77f67bfb0946bd11093eed2a41f3. 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/FR9Z12200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0d98c806b02bd16f45607f3dee1bc1b118345e8df262b0f7b0f42fe71c7935. 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/FR9Z12200127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c47e9a8d4bcb36ef89ae9283537d4fb7b4b8e6df9fd11770b6ec34448a2948f. 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/FR9Z12200160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10ccbe0cde332e81bf4fcb934928cb4b0c1b11fb013214febcb6317e929c449. 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/FR9Z12300083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5fb3e7e2857ae93bf496fa784277b64912a89c689374d908f342e148f4addbf. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/FR9Z12300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b5fb61be1ba29eee5bb75439eef33f8ca911181e222a4c8f0531c40064eee4. 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/FR9Z12300085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24478e0564719228b624c0e2efc9658bb8832752efaae2ae434c2df0903feb3. 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/QZPLS2531733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4dbb412237df462e53eefc566d79c5e3fc8a94134a8ef332ef63b7dbd31f06. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/PLF241300394.