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 0x50c63dd922ec0b074ab8b0ddc394d016e9400811dc4faa06b0025786444bfc2a. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/76dfe6ae-b93b-4833-95c9-5bba54e4a639.json and https://artists.proofprofile.net/proofs/artist/76dfe6ae-b93b-4833-95c9-5bba54e4a639.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 0x6ff0f4b03a261385f340768f1ef1bc7c8572470672ad3c6dd4227a1a87b55195. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZK6G2200924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b889132012dfe6c5afa529e0bffee410e38b444eb7486527f20b6fdd11204f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6G2200926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b342bd4e9f7ed7d501d26ada1108c6e2cd3fa198a5576dd0d9264cb6993d08a. 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/QZK6G2200930.
Between a Father and a Son (Rerecorded version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711e864d8e5293176b0674c405907942ed17c92a526db1b9ecc07545fbabd1fd. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE4GT1800601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4c7992717408f843494bc1807c810a5af00b5f33b6b2885bc8f693c9c1f1c4. 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/QZK6G2202755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7396f14c3198857b566e247bb370271ff630240bca98c4bbac94e5a028b226a. 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/QZWFT2488506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf24400ad3ccd2eaaba1f28f5c06c549e949d1f634a28a5400203d1c7cba6244. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZTB32596191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7396f14c3198857b566e247bb370271ff630240bca98c4bbac94e5a028b226a. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZWFT2488506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b1d09429e159e281824587d0f89fc5a6b1d456911796e57828b3b12cd6d93d. 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/QZTB32596192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa6043baf63c85dcabe18d989b32d0acfc05aec8fafae76a8bffd3bbb66036d. 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/QZK6G2202243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37aba857187a0277ce2dfce15ade98ea4a32b16c097e7ff3ca073ff633d8e3ed. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZTB32596193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392c6bd5051970bac4823ec91c43ec97634bc1d3b5c3554b9d66077608a1df51. 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/QZTB32596194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc360cc5ec8648df3622f2e53711caecfa4646a02f70698e1a16b983281a4b960. 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/QZTB32596195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac70dd5497e842994df3d721353cd1f80d6407ae3dd00523c803bd97895b3da. 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/QZK6G2202244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f15a7e21b27b6316a0894538c92e0d9395b389dd24191c63b8d18ae365a485c. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTB32596196.