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 0x236f9afa1d71001efde2034c5ab7fd5a7927adaf19f08ce89536a4396af3213d. 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/feabb362-8764-42e3-881d-413e42c0dd6a.json and https://artists.proofprofile.net/proofs/artist/feabb362-8764-42e3-881d-413e42c0dd6a.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 0xcbd83f6123d6689b0347d5f214e507150e65e0cb8319cea4c078276aed9f15c1. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/USHM82471994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba36accf2ba9208ed4fd03fdb15e0a6e9525d272b4fee0e34f586b43649d87c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USHM92483857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81a8af07d23fd532c0a574f9ef98260c5efcce5600e5581df6c9e74be6787b79. 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/USHM92483858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25785fc9523b716e1d9910118b0c0636e8cbf5061aedf7e1e9fc640cc8385508. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USHM92483859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab0602ea1fff650c13c04eacbf09aae0cfac896a08705a72ab733758a8f139f. 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/USHM92483860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cff13500417d8ae9b7c918b778e55ab685349d67eda2211c6e33fc6c7b0c4d3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USHM92483861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70fb1edecc50b7636c34980494bb3ecac9429c7b7a571d15f790868b0bfb2326. 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/USHM92483865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b786b97c51fc51061f9da7e8b2ab9178623b93adeede761768ab3a8886eaa4. 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/USL4Q2432514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e4fd41ccbad3dfad4f393bd2a01e129f0cfd887fc71c756f7ac7b4cbfca52b. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USL4Q2432515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94f8de9433888a5025e3cc2f6152257fa45123c3b83519faf0b1c0fdf70e86f. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USL4Q2432516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe112c180ec264fc1ec4430cd2bfa35e2d063c6e4e917378b09c7571bbceb05. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/USL4Q2432517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5957075840c27782c17c4425cbe4e3dad42a1f07645c8ab326509a59a3a52166. 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/USL4Q2432518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2407380e272d2c6ba685ffa77372bcda3762e21137e29d318699780b842fed7e. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/USL4Q2432519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd609128da9a4da31e00de8e8495937033fc291e95881ff3ecff54b91525fd402. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USX9P2455049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772e5499c455892651b2c4c8056f8442428330c736d5878c3b6872318d6894b0. 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/USX9P2455050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c7f336b1b13a462f7d60d1b6a53cdde548e31bf8865c97e914a04a2be6913f. 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/USX9P2455051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e2f4295ce7e4f5c369893d8c1f4f18199a6f03e9279274f39d3b2e8fb465d5. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/USX9P2455052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24ef8f951d91ef756826ab202e01618fd3e70863c0502465eb379ea19560b6d. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/USX9P2455053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfceac270136f50e22180112ec0095ab94e4e51f8b4ae3da47a1589636f416983. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USX9P2455055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcfaaa280292deb9ce49dfdd03743b4860a56f291c5dc8c0caea3930e2eac1f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USX9P2449844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe14ba6bd19746d5ca1e58424c6541247595911040b8508bd12dc127de0e187b. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USY242449145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b265c3ce3e7b7ac2a7368ed5c6543cdf5cfb42a65daa729835d8a85dac9d7bd. 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/USY242449146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d68c77d74cf533ca3dab5369684dfc77ba3df29f56631d97ec3b9b190ea96cd. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USY242449147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5fdf3b163442a33cb02390b3f9b00b84eb15824e8996cdaff81c10300e72ddf. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/USY242449148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c540fc7d79e019516b659837e06002f4569dae92eb51944e565a8a08490883f. 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/USY242449153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969dc901500d9217e6c28f678ab6297ea55b6a4d410bd1cf762307cbdde2b7ad. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/USY242457620.