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 0x0caa58ab92230cc412802576b594fe81f49043562726c027f37b4342a5042364. 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/bc674d7c-d45f-4c70-b2f2-6757e6d4bd7c.json and https://artists.proofprofile.net/proofs/artist/bc674d7c-d45f-4c70-b2f2-6757e6d4bd7c.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 0xa0ed357d07bec6f69a017d7a654dda8cda6cfd244a2dee08b579a6c39f8bcacf. 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/TCAGN2261713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ccd6b6654b405cc80e398e2ad348fa396f41584a59f66d5ac1559ee6d0b946e. 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/TCAGQ2262069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383e313b314756c66a4c8940dae73b6de08f677a70b37f1391d402e64ebdbf47. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/TCAGW2340921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34009a6fbe7425a9f7d4616a970b99474f5279863ed6ab51ceac087e9c820c7c. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/TCAGX2340675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdff62091127111052e7354b0ae5f91741a6147ed75a12bf1dc95acfa52d2c1c. 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/TCAHD2305193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d789deb9f5c156959dff5dc22384df6ef2059b9e067ce05cd1b40d0910903d. 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/TCAHN2368941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22253449871814e06acd4a705b34f33e27355cd531f27075571eb17a0d884d3. 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/TCAHU2429525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ebf8e508f4ca2be1c46ec8f73c6b9b082241482a38571ac75363879492fff4. 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/TCAIS2441665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c89859c24b480b7b32e8e0a10ff3dea962294b4ccc6f8f98b917dbddce709e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAIY2409571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3231d30a5cbcc9d5edb5a09cd6a46106bcf39d792a868d73ce5513a34252fd. 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/TCAJN2541338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60368ab3e68b3dcef54bb9ca00b6121bd3d39fc0bdbe3b95d51b53192db1128. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QT65Y2554063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf477698a374403bb9247730c8d8af7a450c47b39b6f12784ea32c6f6297d6d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W12419835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf477698a374403bb9247730c8d8af7a450c47b39b6f12784ea32c6f6297d6d. 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/FR9W12419835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0258f4f0074fd951b4fe60c3c0a8a8a7ccb5ea3d10cd6683d1b933f6f00d9d35. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAHX2460558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e63a33f120c05ba678da561eeddb5be3f9cca67ff657d2459a3f5cbcbd10bc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR9W12468906.