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 0x085c21c86d573fe47f76afec7365d047a65dc63c6a0041315d5d8f365b476b86. 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/0f6ea648-0ece-4239-8c14-27e6954e828e.json and https://artists.proofprofile.net/proofs/artist/0f6ea648-0ece-4239-8c14-27e6954e828e.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 0xf036218c1129335d099f6657991e5f52f5fe02da9c384d4608d893fe1bd378a4. 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/QZNJX2318593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45618cdb4b6b75342f04c257babbc9d1a21338c3072768c0a08ef930c07df9fe. 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/QZNJX2318596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7950004e3554c4813462e1bcf0297820627f35fa47b0540fef8451e34f7ef93b. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZTPX2314953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4586290d58b085dc1b18fa05388be776539bfddc9a400fadf66a1808cbeaf0b2. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTPX2325284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef2dd4834f1945d59d06b19f29b2927a31a732ca8e8235e55f9a561072b42d4. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZTPX2325148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3615fb17cf93f3e2185c3885c19d6c34a53786b9ddc0f5cb1dc22462d8eecf81. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:58:54Z), 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/QZTPX2326899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7992fd0bd70dc014ffa190a9841d5cbe5cbde24f41086e0a6fe7d68e782d2ce. 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/QZTPX2326917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90345d6b953652d2090a32c5266a2834faefa06f1e53689183640919c56e624a. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZTPX2323396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a177555f754c1ca0c35d19ed5c89c54277dd2c93f6d41aac77b6048f9e1eef. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:59:26Z), 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/QZTPX2326911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a266216e8475493f76114eeac7eb6a91067eac3f1d6952460e67d979e645d1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZW9L2328220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe091cbcd87465c45e76a7fedeb3305d8efb718b5e7213a690999c624cc5c82. 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/QZW9L2328276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd827e756c6275fca98c82d72231f1cd02e0a8b63a16efe7cac63ed101614078f. 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/QZW9L2328325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2edcfc9fcf6ab863cb50889b8fb47931d9afebe1226076d66228125262bae1. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZW9L2356130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1a56541f04421c5565caf7d40a018aa09b589004d8b121163899fbbd898398. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZW9L2440959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b0c9b97d06ad6625cc3ab570a5ff863119dd0631d877499c1a85d767773f6d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZW9L2441080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba032b6c24b4f592a9b93146540da389aff003325301a1db6d5b5ffe735f4a4. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZW9L2442577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0ba05acd5fd2019e594963a0d32442ed2dce0aa02b27775627a3c01564735f. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/QZW9L2442612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf6f0576161adafd8cfb24654c43fc1d0b21a0c902aac9891aed53940510674. 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/QZGLS2542921.