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 0x0cd10b997ee3802bb2c5728b6ada28ac14be75891d8e773af3b2ca3748c9ef73. 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/296032de-ab74-41d3-b6c5-c4c952695c26.json and https://artists.proofprofile.net/proofs/artist/296032de-ab74-41d3-b6c5-c4c952695c26.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 0xfc543b96de909dcf4bc285acc5047b26103ae55f0ffaf2142225c7a498be5cbf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMB622300555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e47d48d510d7fe4da3a716f448c727939ba50e517188e87180ca44d2251678. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMB622300556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e4890651913465a11f00d0d999ade9a3797b7c21aa0ec1de8cd19d95b0051f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QMB622300553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bf9f14a9c0510735f474538c69a596cd3682cece33a302f6ad7789292bf388. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/QMB622300557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006b984bb14af9103f2ff2b69c26cb05be4d2b2fbff4b2904a19a64203d92bf2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMB622300558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcffd73cf2ab735848a1c1d40d2c4ab6c5e8afd5afd67fc09c11d9091a8685cab. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QMB622300559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cdd249d187901e434bcece22bd773f04e6a5cc855306c56061051d20e33c36. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QMB622300560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc19df90798b80d613c58ac360b91d2dbf506f4e066fce0f65475d00510f169. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QMB622300561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042a6e7bf59c8111da6e8423da827b2fc1d6056458e2887b754a6ed403dd7c45. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMB622300562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd417e4a1f47a1bc44566d9d223e0224ff7ba9a7fbd9a0d097cdd42c8a5d0256b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMB622300563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0d983ca8ae18af50a0f6f1e510b215a59120e09ac658b62a2ada1d30c4e0bc. 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/QMB622400501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f37b659ec4ea5c902cfc565d6ec0fe9d5274b1b09d291931b5a31d8f964f56. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QMB622400502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160a7ea4ecb4283c3908ad18415c29c7307c672495c68b1726f6e0213a040cb1. 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/QZHN61978606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0b00c51a954c9275d230d7e2c789b3303b7bbbf601f192e77dd82c60315f2a. 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/QZC5P1800240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b088fabf1e909d23b536f867ee7e582a58062f1cbf9426bbac1c5156a4df39c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWY2072572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160a7ea4ecb4283c3908ad18415c29c7307c672495c68b1726f6e0213a040cb1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHN61978606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4651d0b9f52b6ce02b0027bf21f93cd3b0106853bcf4bd9eebb08a9192eae1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZKDK2080354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe13ceebeb6a6512c9f2f50d029450efc359fbb5fb2fe36d302daeaae1a4e7c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USL4R2091248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5db773b241ef3310429acd3d22bbd0bb5a0a50e588bad39ce5e642f2f399c5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USL4R2091249.