thumb|right|The Rialto Bridge The Rialto is a central area of Venice, Italy, in the sestiere of San Polo. It is, and has been for many centuries, the financial and commercial heart of the city. Rialto
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f880e2917e7bc1f41ed64f4695bc8ca200cca8e4dd4bc6542e8cd88dc07e33. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81a68e3a-6f07-4231-9262-ec62f548e035.json and https://artists.proofprofile.net/proofs/artist/81a68e3a-6f07-4231-9262-ec62f548e035.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef17676170d1bed85fb16d661758bc8cd1c04b74b56349bf440e3405a81de3a. Chain 2 (Bitcoin): anchored in block 957658 (2026-07-12T05:03:28Z), 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/GBAHS9803625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f9b67a431df961e588ec9300f995b2310672036c18fe6a97e3a1ea3e4e2151. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/GBAHS9701693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96eae603f0a6e068604e8dc39ba17a548bc87a459d1f534f85c79ec73fc7591. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:41:35Z), 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/GBAHS9701696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25873314e82911fbe4f40ceb838ccd422ea8ce26b3fa20616727dde101e3ded7. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/GBAHS9701697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf2d54701435bdf1f660973bc3a54c8951fe1de78547d05542b09a32b9ee87b. 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/GBAHS9701698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dad0f42ac470d317bae0b553798db33ac36bca60cb7cfe39246a32b2aae7474. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/GBAHS9701699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ce7298fca501c26c47336257742980ed32c966454dd2c096fec62fc234d65b. Chain 2 (Bitcoin): anchored in block 957653 (2026-07-12T04:35:02Z), 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/GBAHS9701700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0482d1c50b2b64fc12807d0a090c1de6c55506d65aaaaf10a9e7481ea5d39b5b. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:30:47Z), 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/GBAHS9701701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260ee7d082fd23322d3a42c22c199f762f6eda561618e597ebb77620ad148ac3. 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/GBFFA2500000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73498c3e17a0beffd80cf6c57dcde3799f1bec1902ef583a56b39b51d3859a30. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GBFFA2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775fabba946583e1d66bfdd9588015179ecf23e1c7f62f4efcbbb637083fe343. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-17T04:39:04Z), 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/GBFFA2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e03a677328935b024fa394af15c78e3bf273d5778e91ea7430e53a3dc67ac27. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/GBFFA2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73498c3e17a0beffd80cf6c57dcde3799f1bec1902ef583a56b39b51d3859a30. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/GBFFA2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260ee7d082fd23322d3a42c22c199f762f6eda561618e597ebb77620ad148ac3. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/GBFFA2500000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac528e85cdcda5715b8819f44c11c5b5805c7920065c93c108acafaac0d5a11. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/GBFFA2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775fabba946583e1d66bfdd9588015179ecf23e1c7f62f4efcbbb637083fe343. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/GBFFA2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680bed9d54810c6379d6d0ba20a552fff2427ac87345dda84d960bf17b52c5c0. 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/GBFFA2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e03a677328935b024fa394af15c78e3bf273d5778e91ea7430e53a3dc67ac27. 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/GBFFA2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73498c3e17a0beffd80cf6c57dcde3799f1bec1902ef583a56b39b51d3859a30. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/GBFFA2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e8cd38e05537da98ddc2db7bc052d70475cb1a309fb443799dd22a17feb7d2. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/GBFFA2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db5c2ee118ca8eaa8219db8f2e78624d87c42553f6e40064120320ddeec22c0. 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/GBFFA2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8796699cd2df7f33c0c43b178a98589439b022c6251ba6b4d7281f29a9141df. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/GBFFA2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a049fb9ddb8994380562c3a03d8770be838016a0d2c4f00ee5e553f549488af. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/GBFFA2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d00d1960022a58cd5059f5379c17bdec78016582a8733ae015026bdbd88f9c. 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/GBAHS9703515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6a3d1033c4616f3f27d19b55b07484f9fec253d9c193bdb45961c8f2652168. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/GBAHS9701691.