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 0x4891059cbfb2f2d8cd69542d4a7960f008be9549245f7e46cb317b1b443dc57d. 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/484b2488-8d92-447f-82d8-e33181b9cb84.json and https://artists.proofprofile.net/proofs/artist/484b2488-8d92-447f-82d8-e33181b9cb84.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 0xd2bdfb86c7d0fdfdc9732c9bbdf2deca5532e7d9d4a40d69b576fcc403984673. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/ZAVC12100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb682c94e362a924b64be1983b8c65e2542aea98383383264a6a8e83c775f4a32. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ZAQJX2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267c6896005665db8c333e6a222d671efe58fc919aaf33bce475f48089b3797e. 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/ZAVC12400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf796d14b957b61c08afcf422d2972515b2ae49652b64716d60da2572e0e4f733. 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/ZAVC12400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b03abe40ce35ab07b0a468df75c7f8fe484d0030e735fe8343bfe65d72c4cad. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ZAVC12400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa246e91877972f5fd26e03ffacd06963fdbdba6b7f2418260caf5e27550404. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ZAVC12400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5b06f44b3de194c58aefd4f8b7d0fba27fe276134c58d6b737aeafaa3a6b71. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ZAVC12400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb22cd5fb4e420594e3649b256e39f889640bfb24e0cc17267fa7a8969aea1f. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/ZAVC12400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a14c4fcfe05c09774ebcd7a9810254a1d97dfa18cd99a20c2967abde44912c6. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ZAVC12400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2040cb513aa89e2bac940f732eb936fcdf8b64fd2a4639011d2a3dfddd2247. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ZAVC12400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d24a97584e80e827c5bb76601d1118b74f682e2c8bef6933aea593d714aff7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ZAVC12400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2307bec33c39ee03ffabc65e18ce3ed744fb77321f765f8a0de5f4c3538297. 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/ZAVC12100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a87baf548745230677a8d126c9a4622dcf2dbfe86dfb86842992f42067a4cb1. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ZAVC12100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc2ea5c2f38bdbdfc5ee0926486ddf7c44f45a3d5c830b5d95193dd1fc8c730. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ZAVC12100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2bdfb86c7d0fdfdc9732c9bbdf2deca5532e7d9d4a40d69b576fcc403984673. 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/ZAVC12100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e77b0ab29ec52f8014e2cbe7577086df040503f9e27039f14fd113d58a40362. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ZAVC12100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf058c9666b797d633f33d35e6df6b060aeb3127199048d0c5e739a608d7905. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/ZAVC12100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20eb02751e148954b2c18dbe7a26308d561b66b83c20b35a6a96b4c75ce9c95c. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ZAVC12100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc2ea5c2f38bdbdfc5ee0926486ddf7c44f45a3d5c830b5d95193dd1fc8c730. 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/ZAVC12100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dffbe5da1f4a3b4ae0d968e6b28c94f24c65499f3ffd1f5b2b481ae56a07760. 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/ZAA642000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07a4f0dce3457552aa67a2ed0a7e9f5744a9cae5b04ab38a4dabb2f3161a5b0. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ZAY591001066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce8f2a7d8c4c92a51d63bb461b5dc02fa992699e0fd98181c308278a474387f. 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/ZAY591001064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73988da6f33004394334451ae5cacba95be0a82427d73a9f1bd0766e91650ae9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ZAY591001063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271a314116aaafc224c6827a8d95ac363d61600896cac1237e09bc66047c5a3c. 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/ZAY591001065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f6a0e85bf51ec130cdd11145fbf2c48b54299e8c59d8299a69c4dce0954e06. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ZAY591001067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a898370acbf3efc51260097841b22da012904d6f219c7c2062c469959c9400e. 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/ZAY591001062.